Instrumental Methods of Examination, X-rays and Radioisotopic diagnostics in Urological diseases

The Urinary system

Types of Catheters

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Preliminary procedures

Hello everyone! This is the second Urological Hub I am publishing in a day. Whew! As much as it is an achievement, its also a challenge, taking up the mantle just immediately after exams. Well, this hub is published to give each and everyone of us an idea of the instruments and tools used in urological analysis. Sometimes, we need to have an idea of such things so that whenever we approach the Doctor in related situations, we will can easily comprehend and blend with what the doctor is saying.

Diagnostic imaging is a dynamic recent development in medical practice with great potential for benefiting patient care. Nothing has contributed more to the improvement of existing anatomic imaging devices and the development of new ones than digital computers and their related electronics. With computers, the vast numbers of data collected in analog fashion by the basic imaging  mechanics of radiography, Ultrasonography, computerized tomography (CT scanning), tomography are converted electronically into digits corresponding to the different intensities of the original bits of information. These \digits are store in the computer and can be recalled, combined, and manipulated in various ways to achieve reconverted analog images. Hard copies of selected images can be made at the time of the study, or the information can be stored permanently in digital form for subsequent retrieval and conversion to analog images.

Radiography (roentgenography) is the oldest method of urologic imaging, having been used to demonstrate radiopaque urinary calculi shortly after the discovery of X-rays by Wilhelm Roentgen in 1895. Since then, it has continued to be used for diagnosis in every branch of medicine, and it is currently the most widely available method of medical imaging. More recently and other body imaging procedures still in their very early development, eg, magnetic resonance tomography- are competing with, complementing, and in some instances, replacing long established uroradiographic tachniques.

Aseptic Technique

Although bacteria are present in the distal urethra, the urinary tract is considered sterile. Therefore, any instrument entering the tract should be sterile. Instruments made of metal, rubber, and plastic may be autoclaved, but those containing optical devices must be gas-sterilized or soaked for a sufficient time in an approved solution of glutaraldehyde and then thoroughly rinsed in sterile water. The foreskin should be retracted and the glans penis washed thoroughly with cleansing solution. Th vulva must be cleansed and the labia held apart as the instrument is introduced.

Lubrication of Urethra

All transurethral maneuvers require lubrication. In women, application of lubricant to the instrument is sufficient. However, this method does not provide adequate lubrication for the entire male urethra, because the meatus tends to remove most of the lubricant as the instrument is passed. The male urethra should be lubricated by instilling at least 15 mL of a sterile, water soluble lubricant by means of a blunt, cone-tipped syringe. Oils (e.g, mineral or Olive oil) must not be used, since fatal oil emboli may result. The syringe allows introduction of the lubricant with constant, low, steady pressure, which helps overcome the normal tone of the external sphincter. This resistance may be markedly increased in apprehensive patients, leading the inexperienced instrumentalist to an erroneous diagnosis of urethral stricture.

Anesthesia

A simple procedure such as passage of a urethral catheter may be done without anesthesia. If more complex or painful manipulations are planned, sedation or topical, regional, or general anesthesia will be necessary. Sedation may be achieved with barbiturates, tranquilizing agents, or narcotics. Topical anesthesia of the urethral mucosa may be obtained with cocaine, tetracaine, or lidocaine. In females, a cotton applicator moistened with the anesthetic may be placed in the urethra for 5 minutes. In males, these agents in liquid form are rapidly absorbed into the circulation through the posterior urethra. Contact with traumatized mucosa or injection under pressure increases the absorption. This can lead to seizures, circulatory collapse, and cardiopulmonary arrest. Dyclonine, 0.5% has been used without toxicity in males. Wherever these drugs are used as topical anesthetics for the urethra, resuscitation equipment should be available. Lidocaine as a 2% solution in carboxymethylcellulose gel provides lubrication as well as safe topical anesthesia. The drug is less readily absorbed in this form and can be used in both the male and female urethra. In females, approximately 3-5mL of the jelly is instilled into the urethra. To occlude the meatus, a cotton swab lubricated with jelly may be placed in the distal urethra or a sponge may be placed in the distal vagina. In males, 15-30mL of the jelly is instilled 5-10 minutes prior to the procedure, a penile clamp is placed at the corona; and a small amount of jelly is instilled in the distal urethra. Topical anesthesia is effective on the mucosa only and will not prevent pain from pressure or from distortion of underlying structures during manipulation. Regional or general anesthesia should be planned if more painful procedures (eg, resection or bipsy) are contemplated or if the patient is very apprehensive. The regional anesthetic must reach the third lumbar segment to provide the necessary sensory ablation during transurethral resection; thus, spinal or epidural anesthesia rather than a sacral block must be used. General anesthesia must be used when cystourethroscopy is done in pediatric patients.

Warning to Patients

Instrumentation is uncomfortable and may be painful. A forewarned, cooperative patient will be of help. Explaining the proposed maneuvers as one proceeds may reduce the patient's anxiety. The instrument must be introduced gently and advanced gradually. Gentle, sure maneuvering with adequate lubrication is essential. No movement should be rough or abrupt. Discomfort will increase as the instrument passes through the prostatic urethra, and men must be warned to anticipate some discomfort as this area is approached. Once spasm of the external sphincter develops, it may be impossible to complete the instrumentation. A very high bladder neck will cause marked angulation of the urethra that may preclude instrumentation under topical anesthesia.

Other Instrumental procedures and examinations in urology

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Contributors

Urological sub-department of the department of Surgery, Ternopil State Medical University
Urological sub-department of the department of Surgery, Ternopil State Medical University | Source
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Instrumental Methods of Examination in Urology

In most cases, a good knowledge in such instruments gives us the platform to ask constructive and intelligent questions to the medical personnel. Hence in as much as this is very good for the medical practitioner, it is also very good to the general public, and as usual, I will try and make it as simplified as possible for easy digestion. As for the Doctors and Nurses, in every urological practice, instrumental and Endoscopic methods of Examination of Urinary bladder in patients play very important role and so therefore, learning the usuage of catheters, uretherscopy and cystoscopy is very essential. Also, X-ray diagnostic has a great importance in our present medical world. Without X-ray and radioisotopic methods of diagnostic, any of urological diseases is impossible to diagnose.

Catherterization

Types of catheters

In general, straight rubber catheters are used for routine diagnostic catheterization. However, a coude (elbow) catheter, which is stiffer and has a curved tip, may be more readily manipulated over an enlarged prostate that has elevated the bladder neck. Uretheral catheters are: Foley, Whistle-tip, Pezzer, Malecot, Robinson, Coude.

The method of catheterization of urinary canal with plastic catheter

After proper cleansing and lubrication, the catheter can be manipulated with a sterile-gloved hand. However, it may be simpler to grasp the catheter near its tip with a sterile clamp and hold the other end of the catheter between the fourth and fifth fingers of the same hand. The catheter can then be advanced with the clamp without being touched by the unsterile hand. Begin catheterization with the penis pointed slightly drawn out.

Method of catheterization of Urinary canal with metallic catheter (in women and men)

After proper urethral lubrication, the tip of the conductor enters the urethra. The conductor is in the horizontal position over the groin. The penis is pulled out on the conductor, which is advanced down the Urethra and move simultaneously to the midline; its handle is gradually moved to the vertical position. The conductor will usually pass through the external urinary sphincter if gentle pressure is exerted on the handle at right angles to its shaft with one finger. When the conductor has passed all the way into the bladder it should be possible to rotate it freely.

Ureteral catheterization

These techniques are utilized in the evaluation of hematuria, chronic or recurrent urinary infection, unexplained urologic symptoms (eg, enuresis, frequency), and evaluation of congenital anomalies. They are also useful in any clinical situation in which excretory urogram have suggested pathologic change but have furnished all the information necessary for definitive diagnoses and treatment.

Filiform and followers

Filiform and followers are instruments used to dilate narrow strictures. Filiforms have woven fiber cores with a coated surface; they are very pliable and smooth. Useful sizes are 3-6F. The follower is made of metal or of woven of pliable fiber. Useful sizes are 8-30F. After lubrication jelly has been instilled into the urethra, the filiform is introduced. If it is arrested, it must be partially withdrawn, and readvanced. If this fails, one or file should be added to the first and all manipulation should be repeated.

Cystoscopy

A cystogram is a radiogram showing radiopaque outlining of the bladder cavity. Cystograms are seen as part of ordinary excretory urograms, but direct radiographic cystograms can be obtained by instilling a radipaque fluid directly into the bladder. The contrast medium is usually instilled via a transurethral catheter, but when necessary, it can be administered via percutaneous suprapubic bladder puncture. Radiograms of the filled bladder are taken using standard overhead X-ray tube equipment, or less frequently, "spot" films are taken during real-time, direct image-intensidied fluoroscopy.

Modern cystourethroscopes have a metal sheath ranging in size from 8F to 26F and interchangeable fiberoptic telescopes allowing a view from 0 to 170 degrees. The 0 to 30 degrees lenses are best for visualizing the urethra, whereas the bladder walls are best inspected with the 70 degrees lens. A retrograde (170-degrees0 lens must be used to see the vesical side of the bladder neck, particularly where prostatic tissue obstructs the view. Complete endoscopic studies are among the most precise diagnostic tests in all medicine. Any urethral lesion (e.g, Verrucae, tumors, strictures and diverticular), as well as the size and configuration of the prostate and bladder neck, are noted before the bladder is inspected. When the bladder is entered, the trigone is visualized and the size, shape, position and number of ureteral orifices noted. The bladder wall is carefully inspected for tumors, stones, diverticula, ulcers, trabeculation, hemorrhage, and edema. The normal and abnormal cystourethreoscopic findings must be specifically described.

Contraindications of cystoscopy

Cystoscopy is contraindicated in acute tract urinary infection, because trauma may exacerbate the infection and lead to sepsis. It is relatively contraindicated in the presence of severe symptoms of prostatic obstruction, since trauma may produce just enough edema of the bladder neck to cause complete urinary retention. Of course, if cystoscopy is essential, this risk must be accepted. The conditions in which cystoscopy is unnecessary are: when the volume of Urine in the bladder is more than 75ml and the environment around the bladder is transparent. A normal cystoscopic picture shows a dynamic bladder wall in which as bladder fills, small lesions will move away and may escape the examiner's field. Special care must be taken not to overdistend the bladder and to make sure that all areas have been completely inspected, often with the bladder minimally filled initially. In Adults, most of the bladder wall cannot be seen if the bladder contains more than 200-300mL of Urine.

Method of Puncture of Urinary bladder

A suprapubic catheter is useful in males when the urethra is impassable (e.g, traumatic disruption or stricture). When there is epididymitis or severe urethritis, or when prolonged bladder drainage by means of an indwelling catheter is necessary. An indwelling urethral catheter predisposes to meatitis, urethritis and epididymitis. The skin of the suprapubic area is prepared and infiltrated with a local anesthetic. If the patient is in Urinary retention, the bladder is usually readily palpated. The bladder must usually contain a minimum of 200-300mL of Urine before a suprapubic catheter can be inserted successfully. The patient may be placed in the Trendelenburg position to move the intestine upwards. A thin lumbar punctur needle is inserted above the symphisis pubica and angled toward the perineum to locate the bladder a trocar is inserted into the bladder and the suprapubic tube passed. Size 8F, 10F, and 12F suprapubic catheters are available in prepackage sets.

X-ray diagnostics

It is no longer considered necessary that patients should be dehydrated in preparation for urography. Indeed, dehydration is to be avoided in infants, debilitated and aged patients, and patients with diabetes mellitus renal failure, multiple myeloma, or hyperuricemic states. On the other hand, preliminary bowed cleansing is very desirable, although children under age 10 years usually need no bowel preparation for urography.

Urography (KUB)

A plain film of the abdomen, frequnelty called a KUB (Kidney-Ureter-bladder) film, is the simplest uroradiologic study and the first performed in any radiographic examination of the abdomen or urinary tract. It is usually the preliminary radiogram in more extended radiologic examinations of the urinary tract, such as urography. The size of normal kidneys varies widely, not only between like individuals but also with age, sex and body stature. The long diameter of the kidney is the most widely used and most convenient radiographic measurement. The average adult kidney is about 12-14cm long, and the left kidney is ordinarily slightly longer than the right one.

X-ray contrastive stones, and their diagnostics

Identification on the plain film of calcification or calculi anywhere in the urinary tract may help to identify specific kidney diseases (eg, the calcifications occasionally seen in a Kidney cancer) or may suggest primary disease elsewhere (eg, the occasional patient with nephrocalcinosis whose underlying primary disease is hyperparathyroidism) Contrastive substances or radiographic contrast media include Liquids (almost all fo whih contain iodine), gels, solids (eg, barium preparations), and gases (most commonly air nitrous oxide and carbon dioxide). Some contrast media can only be administered by one route, which limits their usefulness for multisystem anatomic imaging.

Excretory Urography

The excretory urogram, formerly called an intravenous pyelogram, is most commonly used. Excretory urograms can demonstrate a wide variety of urinary tract lesions, are simple to perform, and are well tolerate by most patients. Ocassionally, however, retrograde urograms may be required if the excretory urogram is unsatisfactory or the patient has a history of significant adverse reaction to intravascular contrast media. The advent of excretory urography using high volumes of radiopaque contrast media and ureteral compression has decreased the need for retrograde urograms. Abdominal (ureteral) compression devices that temporarily obstruct the upper urinary tracts during excretory urograms dramatically improve the filling of renal collecting structures.

Retrograde Urography

This is a moderately invasive procedure that requires cystoscopy and the placement of catheters in the urethers. A radiopaque contrast medium is introduces into the ureters or renal placement of catheters in the ureters. A radiopaque contrast medium is introduced into the ureters or renal collecting structures through the ureteral catheters and radiograms of the abdomen are then taken. The study, which is more difficult than an excretory urogram, must be performed by a urologist. Some type of local or general anesthesia must be used, and the procedure can occasionally cause later morbidity or urinary tract infection.

Infusional Urography

The use od greater than average amounts of standard contrast medium- and thus greater amounts of iodine per Kilogram of body weight- may be indicated in selected patients. The high volumes may be injected either rapidly as a bolus or more slowly as an infusion; the bolus method produces better visualization and a better urographic nephrogram than the infusion method.

Urethrography

This method of outlining the renal collecting structures and ureters is occasionally used when urinary tract imaging is necessary but excretory or retrograde urography has failed or is contraindicated or when there is a nephrostomy tube in place and delineation of the collecting system of the upper urinary tract is desired. The contrast medium is introduced either through nephrstomy tubes, if these are present (nephrostogram), or by direct injection into the renal collecting structures via a percutaneous puncture through the patient's back.

Arteriography

arteriographic study of the Kidneys is performed almost exclusively by percutaneous needle puncture and catheterization of the common femoral arteries or, much less often, the axillary arteries. Rapid serial radiograms are obstained during and after bolus injection of suitable radiopaque contrast medium into the aorta at the level of the renal arteries (aortorenal arteriogram, "flush" abdominal aortogram) or into one of the renal arteries (selective renal arteriogram).

Isotopic renography

Radioisotopic techniques provie a means of investigating the structure and function of internal organs without disturbing normal physiologic processes. Currently, 4 general types of renal readioisotopic labels are used. Classified according to the mechanisms of labeling, they are as follows;

  1. renal cortex labels, which are retained in the renal tubular cells,
  2. intravascular compartment labels;
  3. renal tubular function labels, which briefly lable the renal cortex as they are accumulated by renal tubular cells and then are passed into the urine and cleared from the Kidney; and
  4. Substances cleared solely by glomerular filtration, which allow determination of the glomerular filtration rate.

Metal sounds

Metal (stainless steel or nickel-plated steel) sounds are used for uretral dilatation.

In Men

With the Penis stretched taut and the instrument held almost horizontally (over the groin), the tip of the sound is introduced into the lubricated urethra. When the tip reaches the bulb (at the external sphincter), the handle is brought to the vertical position, which usually enables the tip to pass through the sphincter. Moving the handle to the horizontal position (parallel to the thighs0 causes the sound to advance into the bladder. The first sound passed should be a 24F, even though the patient says he has a narrow stricture. This size has a broad tip that will not perforate a friable urethral wall and is therefore ideal for urethral exploration. if a 24F sound cannot be passed, smaller sounds can be tired. If a 20F will not pass, do not use the smaller sizes, because their tips are relatively sharp and may pierce the urethral wall. In such cases, filiforms and followers may be used.

In women

Due to the short and relatively straight canal of the female urethra, the passage, of sounds is quite simple in women. Significant stricture is rare.

Resectoscope

The resectoscope is a commonly used visual instrument with which transurethral resection of the prostate or of vesical carcinoma is performed. Resectoscopes remove tissue by means of the electrocauterizing retractile loop that makes multiple passes and cuts away the tissue in strips ("chips"). Hemostasis is obtained by cautery of individual blood vessels as they are visualized. Newer continuous-flow models have a double sheath that allows continuous inflow and outflow of irrigant, which provides a constantly clear view and stable bladder pressure. When the flow rate is properly set, this system allows nearly nonstop resecting, because the bladder never becomes completely distended. Due to the continuous flow allows the bladder wall to remain in a relatively stable position, this instrument is useful in resecting large bladder tumors.

Urethrotome

Current models allow direct visualization. Simple lithotrites have metal jaws that crush small vesical calculi. Electrohydraulic and ultrasonic lithotrites trnasmit energy through special catheters place by means of the cystourethroscope; when the catheter is touched to the calculus and energy is applied, the calculus disintegrates.

Needle Biopsy of the Prostate

Various types of soft-tissue biopsy needles that remove cores of tissue from a suspicious area are available. In addition, needle aspiration to obtain specimens for cytologic examination is promising. The prostate may be approached via the perineal or transrectal route. After a local anesthetic is injected into the perieal skin, a finger in the rectum guides the tip of the needle (which is outside the rectal wall) to the suspicious area. The transrectal route does not require mucosal anesthesia but may be difficult to use in patients with tight anal sphincters. An enema given before the transrectal procedure is useful. It may be easier to biopsy small nodules via the transrectal route since the needle and the palpating finger are in direct contact. A needle biopsy may be done under general or spinal anesthesia in conjunction with cystoscopy.



X-ray Machine

A classic contemporary X-ray Machine
A classic contemporary X-ray Machine

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Comments 61 comments

D.Virtual.Doctor profile image

D.Virtual.Doctor 5 years ago from Europe Author

i just want you all to have an idea on the various instruments used in urological analysis and exams, we still have specifically more instruments~~ Retrograde cystoscopy, retrograde pyelography, excretory urography, infusional urography, percutaneous antegrade urograms, percutaneous, Retrograde Urograms, voiding cystourethrography, Urethrography, vasography, lymphagiography, angiography, Aortorenal and selective Arteriography, inferior venacavography, selective renal venography, Adrenal Angiography, Miscelleneous urologic angiography and many more.. Just have a glance at the ones here and have an idea..... Thanks and once again, enjoy!

D.Virtual.Doctor


al_masculine 5 years ago

Your photos alone are informing enough... Thank you! i have always been hearing of the Whistle-tip catheter and Foley, now I have seen them. I wanted to see Condom catheter, but a lil disappointed, cos I didn't see it (kiddig). Nice work D.V.D. What about the adverse reactions of the Urethra and Bladder instruments?


D.Virtual.Doctor profile image

D.Virtual.Doctor 5 years ago from Europe Author

Once again al_masculine... Thanks so much for your consistency in reading my hubs... Yeah, is Urethra and Bladder (sounds, cystoscopy), some bleeding is to be expected in men. Burning on urination and frequency may be noted because of trauma to the mucous membrane. Acute urinary retention may develop in men suffering from moderate prostratism. This may be due to edema from the instrumentation. Exacerbation of lower urinary tract infection may occur, particularly if there is residual urine. Epididymitis may develop if prostatocystitis is present. "Urethral chill" (baceremia) may lead to septic complications and must be antifipated following instrumentation in the presence of an infected prostate or vesicoureteral reflux.


al_masculine 5 years ago

Thank you my doc!


Dchosen_01 5 years ago

As for Ureteral catheterization or Urography; Ureteral catheterization may be performed without general or spinal anesthesia. However, nausea, vomiting, abdominal cramps and back pain may occur from overdistention of the renal pelvis with contrast material or from edema secondary to trauma. If the catheter peirces the renal parenchyma, bleeding and clot colic may also ensue. Kidney infection may be exacernated, or new infection may be introduced. Temporary anuria is rare; it may be caused by excessive ureteral edema from instrumentation in bilateral studies or by sensitivity to the urographic medium............ I hope I did well my dear D.V.D!


D.Virtual.Doctor profile image

D.Virtual.Doctor 5 years ago from Europe Author

Absolutely, and thanks a lot


Dchosen_01 5 years ago

You are welcome D.V.D


D.Virtual.Doctor profile image

D.Virtual.Doctor 5 years ago from Europe Author

In medicine, a catheter is a tube that can be inserted into a body cavity, duct, or vessel. Catheters thereby allow drainage, administration of fluids or gases, or access by surgical instruments. The process of inserting a catheter is catheterization. In most uses, a catheter is a thin, flexible tube ("soft" catheter), though in some uses, it is a larger, solid ("hard") catheter. A catheter left inside the body, either temporarily or permanently, may be referred to as an indwelling catheter. A permanently inserted catheter may be referred to as a permcath.

The ancient Syrians created catheters from reeds. "Katheter - ???????" originally referred to an instrument that was inserted such as a plug. The word "katheter" in turn came from "kathiemai - ????????" meaning "to sit". The ancient Greeks inserted a hollow metal tube through the urethra into the bladder to empty it and the tube came to be known as a "katheter"

Uses

Placement of a catheter into a particular part of the body may allow:

draining urine from the urinary bladder as in urinary catheterization, e.g., the Foley catheter or even when the urethra is damaged as in suprapubic catheterisation.

drainage of urine from the kidney by percutaneous (through the skin) nephrostomy[1]

drainage of fluid collections, e.g. an abdominal abscess

administration of intravenous fluids, medication or parenteral nutrition with a peripheral venous catheter

angioplasty, angiography, balloon septostomy, balloon sinuplasty, cardiac electrophysiology testing, catheter ablation. Often the Seldinger technique is used.

direct measurement of blood pressure in an artery or vein

direct measurement of intracranial pressure

administration of anaesthetic medication into the epidural space, the subarachnoid space, or around a major nerve bundle such as the brachial plexus

administration of oxygen, volatile anesthetic agents, and other breathing gases into the lungs using a tracheal tube

subcutaneous administration of insulin or other medications, with the use of an infusion set and insulin pump

A central venous catheter is a conduit for giving drugs or fluids into a large-bore catheter positioned either in a vein near the heart or just inside the atrium.

A Swan-Ganz catheter is a special type of catheter placed into the pulmonary artery for measuring pressures in the heart.

An embryo transfer catheter is designed to insert fertilized embryos from in vitro fertilization into the uterus. They may vary in length from approximately 150 mm to 190 mm.

An umbilical line is a catheter used in Neonatal Intensive Care Units (NICU) providing quick access to the central circulation of premature infants.

A Touhy borst adapter is a medical device used for attaching catheters to various other devices.

A Quinton catheter is a double or triple lumen, external catheter used for hemodialysis.

An intrauterine catheter, such as a device known as a 'tom cat', may be used to insert specially 'washed' sperm directly into the uterus in artificial insemination. A physician is required to administer this procedure.

from

http://en.wikipedia.org/wiki/Catheter


Holy Cross Hospital Silver Spring, MD 5 years ago

Inventors of catheters

The modern application of the catheter was in use at least by 1868 when Dr. N.B.Sornborger patented the Syringe and Catheter (patent #73402) with features for fastening it to the body and controlling the depth of insertion.

David S. Sheridan was the inventor of the modern disposable catheter in the 1940s. In his lifetime he started and sold four catheter companies and was dubbed the "Catheter King" by Forbes Magazine in 1988. He is also credited with the invention of the modern "disposable" plastic endotracheal tube now used routinely in surgery. Prior to his invention, red rubber tubes were used, sterilized, and then re-used which often led to the spread of disease and also held a high risk of infection. As a result Mr Sheridan is credited with saving thousands of lives.

In the early 1900s, a Dubliner named Walsh and a famous Scottish urinologist called Norman Gibbon teamed together to create the standard catheter used in hospitals today. Named after the two creators, it was called the Gibbon-Walsh catheter. The Gibbon and the Walsh catheters have been described and their advantages over other catheters shown. The Walsh catheter is particularly useful after prostatectomy for it drains the bladder without infection or clot retention. The Gibbon catheter has largely obviated the necessity of performing emergency prostatectomy. It is also very useful in cases of urethral fistula. A simple procedure such as dilatation of the urethra and passage of a Gibbon catheter often causes the fistula to close. This catheter is also of use in the treatment of urethral stricture and, as a temporary measure, in the treatment of retention of urine caused by carcinoma of the prostate

Benjamin Franklin invented a flexible catheter for his brother who had a bladder stone.

[edit]Materials

A range of polymers are used for the construction of catheters, including silicone rubber, latex, and thermoplastic elastomers. Silicone is one of the most common choices because it is inert and unreactive to body fluids and a range of medical fluids with which it might come into contact. On the other hand, the polymer is weak mechanically, and a number of serious fractures have occurred in catheters[citation needed]. For example, silicone is used in Foley catheters where fractures have been reported, often requiring surgery to remove the tip left in the bladder.

[edit]Interventional procedures

Different catheter tips can be used to guide the catheter into the target vessel. Refer to [2] for a picture of different catheter tips and their respective names.

from

http://en.wikipedia.org/wiki/Catheter


Ospedale Sant Anna di Ferrara 5 years ago

A urinary catheter is any tube system placed in the body to drain and collect urine from the bladder.

Information

Urinary catheters are used to drain the bladder. Your health care provider may recommend a catheter for short-term or long-term use because you have or had:

Urinary incontinence (leakage of urine or the inability to control when you urinate)

Urinary retention (being unable to empty the bladder when you need to)

Surgery that made a catheter necessary, such as prostate or gynecological surgery

Other medical conditions such as multiple sclerosis, spinal cord injury, or dementia

Catheters come in many sizes, materials (latex, silicone, Teflon), and types (Foley, straight, coude tip). A Foley catheter, for example, is a soft, plastic or rubber tube that is inserted into the bladder to drain the urine.

In general, the smallest possible catheter will be used. Some people may need larger catheters to control urine leakage around the catheter or if the urine is thick and bloody or contains large amounts of sediment.

There are three main types of catheters:

Indwelling catheter

Condom catheter

Intermittent (short-term) catheter

INDWELLING URETHRAL CATHETERS

An indwelling urinary catheter is one that is left in place in the bladder. Indwelling catheters may be needed for only a short time, or for a long time. These catheters attach to a drainage bag to collect urine. A newer type of catheter has a valve that can be opened to allow urine to flow out, when needed. An indwelling catheter may be inserted into the bladder in two ways:

Most often, the catheter is inserted through the urethra, which is the tube that brings urine from the bladder to the outside of the body

Sometimes, the doctor will insert a tube, called a suprapubic catheter, into your bladder from a small hole in your belly. This is done as an outpatient surgery or office procedure.

An indwelling catheter has a small balloon inflated on the end of it. This prevents the catheter from sliding out of the body. When it's necessary to remove the catheter, the balloon is deflated.

CONDOM CATHETERS

Condom catheters are most frequently used in elderly men with dementia. There is no tube placed inside the penis. Instead, a condom-like device is placed over the penis. A tube leads from this device to a drainage bag. The condom catheter must be changed every day.

INTERMITTENT (SHORT-TERM) CATHETERS

Some people only need to use a catheter on occasion. Short-term, or intermittent, catheters are removed after the flow of urine has stopped. For more information on this type of catheter, see: Clean intermittent self-catheterization.

DRAINAGE BAGS

A catheter is usually attached to a drainage bag. There are two types:

A leg bag is a smaller drainage device that attaches by elastic bands to the leg. It is usually worn during the day, because it fits discreetly under pants or skirts. It is easily emptied into the toilet.

A down drain is a larger drainage device. It may be used during the night. This device is hung on the bed or placed on the floor.

The drainage bag must always stay lower than the bladder to prevent urine from flowing back up into the bladder. Empty the drainage device at least every 8 hours, or when it is full.

Some experts recommend cleaning the drainage bag periodically. Remove the drainage bag from the catheter (attach the catheter to a second drainage device during the cleaning).

Cleanse and deodorize the drainage bag by filling the bag with two parts vinegar and three parts water. You can substitute chlorine bleach for the vinegar and water mixture. Let this solution soak for 20 minutes. Hang the bag with the outlet valve open to drain and dry the bag.

from

http://www.nlm.nih.gov/medlineplus/ency/article/00...


Northwestern Memorial Hospital Chicago, IL 5 years ago

HOW TO CARE FOR A CATHETER

To care for an indwelling catheter, cleanse the urethral area (where the catheter exits the body) and the catheter itself with soap and water every day. Also thoroughly cleanse the area after all bowel movements to prevent infection.

If you have a suprapubic catheter, the opening in your belly and the tube must be cleansed daily with soap and water, then covered with dry gauze.

Drinking plenty of fluids can help prevent infections. Discuss this issue with your health care provider.

Wash your hands before and after handling the drainage device. Do not allow the outlet valve to touch anything. If the outlet becomes obviously dirty, clean it with soap and water.

Some people have occasional leakage of urine around the catheter. This may be caused by:

A catheter that is too small

Bladder spasms

Constipation

Improper balloon size

Urinary tract infections

If bladder spasms occur or there is no urine in the drainage bag, the catheter may be blocked by blood or thick sediment. Or, there may be a kink in the catheter or drainage tubing. Sometimes spasms are caused by the catheter irritating the bladder. Such spasms can be controlled with medication, although most patients eventually adjust to the irritation and the spasms go away. If you have been shown how to irrigate (or flush) the catheter, doing so may help reduce spasms. If you have not been instructed on irrigation, and urine is not flowing into your collection device, contact your health care provider immediately.

POTENTIAL COMPLICATIONS

Complications of catheter use include:

Allergy or sensitivity to latex

Bladder stones

Blood infections (septicemia)

Blood in the urine (hematuria)

Kidney damage (usually only with long-term, indwelling catheter use)

Urethral injury

Urinary tract or kidney infections

Contact your health care provider if you develop or notice:

Bladder spasms that do not go away

Bleeding into or around the catheter

Catheter draining very little or no urine, despite drinking enough fluids

Fever or chills

Leakage of large amounts of urine around the catheter

Skin breakdown around a suprapubic catheter

Stones or sediment in the urinary catheter or drainage bag

Swelling of the urethra around the catheter

Urine with a strong smell, or that is thick or cloudy

If the catheter becomes clogged, painful, or infected it will need to be replaced immediately.

Alternative Names

Catheter - urine; Foley catheter; Indwelling catheter; Suprapubic catheters


Universitätsklinikum Ulm 5 years ago

Catheters are hollow tubes, usually made of plastic or rubber, that either deliver or remove fluids to or from the body. They are one of the oldest devices in medicine, first used by the Greek physician Erastratus in the third century B.C.E. Practical applications of catheters in medicine are almost boundless, and new applications are developed frequently. Common uses of catheters are discussed below.

The foley catheter treats urinary incontinence or is used during long medical procedures and surgeries. Women who have an epidural during the labor and delivery of a child will generally have a foley catheter placed because the epidural anesthetics result in a loss of bladder control.

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Intravenous (IV) therapy also relies on a catheter to, generally, transfer fluids into the body. IVs can also be used to extract fluids from the body. When donating blood, for example, an IV is used to collect blood from the body and through the catheter conduit, store it in plastic bags for later use. Completing the circle, patients needing transfusions receive the blood via catheters or caths.

Catheters are also greatly beneficial in diagnosis and treatment of various cardiac conditions. An angiogram, or catheterization, inserts a cath directly into an artery, gently working its way up to the heart. The cardiologist is able to visualize, through this procedure, the heart, blood vessels and pressure, and any blockages or anomalies. This minimally invasive procedure is often done with mild sedation as opposed to general anesthesia, and thus can be used on seriously ill patients who are at greatest risk under general anesthesia. Recovery from an angiogram is quick and it is generally considered an outpatient procedure.

Through using angiography, physicians developed a way to clear blockages or open narrow passageways in arteries (angioplasty) using a balloon catheter. When the cardiologist encounters a blockage, a small portion of the catheter is slowly inflated to clear the blockage. This particular usage of the catheter has eliminated, for many patients, the need to undergo the far more stressful and invasive coronary bypass surgery.

Catheters also prove useful in Chorionic villi sampling, where a sample taken from the embryonic membrane in the uterus provides expectant parents with information about whether their child has certain types of birth defects or chromosomal anomalies. The extraction of amniotic fluid for amniocentesis relies on the catheter, as does harvesting eggs or implanting embryos in women who cannot conceive by other means.

Foley Catheters Indwelling Urinary Catheter Urinary Catheter Insertion Types Of Urinary Catheters Foley Catheter Balloon Male Urinary Catheter Urinary Foley Catheter

These examples represent just a tithe of how catheters are used. When canals were first built to open up waterways and provide new and shorter means of transportation, they were considered as one of the most important inventions to humans. The catheter is analogous to the canal, providing the medical profession with immediate access to our bodies, and some of the most efficient ways of improving the health of all people.

from

http://www.wisegeek.com/what-are-catheters.htm


Hospital Regional Universitario Carlos Haya 5 years ago

Indwelling Urinary Catheter on wiseGEEK:

The long term use of an indwelling urinary catheter can sometimes produce frequent male urinary tract infection symptoms. An indwelling urinary catheter can introduce various types of bacteria into the bladder.

There are a number of reasons to use an indwelling catheter, ranging from a desire to measure urine output after surgery to an incontinence management plan. The key difference between an indwelling catheter and other types of urinary catheters is that the catheter is meant to be left in place, rather than being used once to drain urine and then removed.

Foley Catheters on wiseGEEK:

This sterile water fills the balloon at the end of the tubing to hold the catheter in place. There can be risks associated with Foley catheter insertion. If a sterile environment is not established before insertion, the catheter could carry bacteria into the urethra.

The collected urine remains in the collection bag until it is emptied into the toilet. Another name for an external male catheter is a condom catheter. Foley catheters are those placed directly into the urethra, and are much more invasive than the external catheter.

Urinary Catheter Insertion on wiseGEEK:

There are a number of reasons to use an indwelling catheter, ranging from a desire to measure urine output after surgery to an incontinence management plan. The key difference between an indwelling catheter and other types of urinary catheters is that the catheter is meant to be left in place, rather than being used once to drain urine and then removed.

This sterile water fills the balloon at the end of the tubing to hold the catheter in place. There can be risks associated with Foley catheter insertion. If a sterile environment is not established before insertion, the catheter could carry bacteria into the urethra.

Types Of Urinary Catheters on wiseGEEK:

There are a number of reasons to use an indwelling catheter, ranging from a desire to measure urine output after surgery to an incontinence management plan. The key difference between an indwelling catheter and other types of urinary catheters is that the catheter is meant to be left in place, rather than being used once to drain urine and then removed.

Cardio catheters can cause internal bleeding if they are not removed correctly. Urinary catheters can cause tearing and urethra damage if they are not lubricated correctly.

Foley Catheter Balloon on wiseGEEK:

This sterile water fills the balloon at the end of the tubing to hold the catheter in place. There can be risks associated with Foley catheter insertion. If a sterile environment is not established before insertion, the catheter could carry bacteria into the urethra.

Typically, the urethral catheter is used when obstructions such as urinary strictures are present, or when the urinary tract does not effective work to eliminate urine from the body. Sometimes, a urethral catheter is referred to as a Foley catheter. Occasionally, a urethral catheter may be indicated to keep an individual dry, which is important in the presence of decubitus ulcers, or bed sores.

Male Urinary Catheter on wiseGEEK:

The long term use of an indwelling urinary catheter can sometimes produce frequent male urinary tract infection symptoms. An indwelling urinary catheter can introduce various types of bacteria into the bladder.

A catheter tube may be inserted in the bladder for short or long-term use due to urinary incontinence or leakage, dementia, spinal cord injury, surgery, or any other condition that makes it difficult or impossible for a patient to control urination. Typically, a urinary catheter is inserted into the bladder through the urethra, though it can also be placed directly, through a small hole in the abdomen.

Urinary Foley Catheter on wiseGEEK:

This sterile water fills the balloon at the end of the tubing to hold the catheter in place. There can be risks associated with Foley catheter insertion. If a sterile environment is not established before insertion, the catheter could carry bacteria into the urethra.

— like a small water balloon at the end of a hollow, thin tube. The Foley catheter then deposits the collected urine into a bag. Urine output can then be.


Nationwide Children's Hospital 5 years ago

A condom catheter is a male urinary incontinence device consisting of a flexible sheath that fits over the penis just like a condom. The condom part is then attached to a tube that drains the urine into a urinary storage bag. These types of catheters are usually good for those individuals who suffer from male urinary incontinence due to a medical condition or advanced Alzheimer's disease.

The condom catheter is easy to use, since it is simply rolled onto the penis. It is then attached to the penis using one of several methods. Sometimes this external catheter is secured using double-sided adhesive. Another way of securing the condom catheter to the penis is with a jockey-type strap or a foam strap.

Male Condom Catheter on wiseGEEK:

A condom catheter is a male urinary incontinence device consisting of a flexible sheath that fits over the penis just like a condom. The condom part is then attached to a tube that drains the urine into a urinary storage bag.

The collected urine remains in the collection bag until it is emptied into the toilet. Another name for an external male catheter is a condom catheter. Foley catheters are those placed directly into the urethra, and are much more invasive than the external catheter.

Condom Catheter Drainage on wiseGEEK:

Urine is irritating to the skin, so it is important the incontinence pads or underwear are changed frequently to avoid any damage to the skin. Urinary drainage storage bags for the condom catheter come in various sizes to accommodate the activity level of the individual.

The catheter is used for men who deal with urinary incontinence and prefer not to use diapers or pads. The external catheter is also called a urinary sheath, condom catheter or penile sheath. The external catheter is made from different materials, such as silicone, polyvinyl or rubber latex.

External Condom Catheter on wiseGEEK:

These types of catheters are usually good for those individuals who suffer from male urinary incontinence due to a medical condition or advanced Alzheimer's disease. The condom catheter is easy to use, since it is simply rolled onto the penis.

The collected urine remains in the collection bag until it is emptied into the toilet. Another name for an external male catheter is a condom catheter. Foley catheters are those placed directly into the urethra, and are much more invasive than the external catheter.

Coude Catheter on wiseGEEK:

The design was developed in the 1800s by a French physician who named it after himself. Many medical equipment manufacturers produce coude catheters along with supplies and accessories such as urine collection bags.

For urinary tract problems, catheter supplies include a straight catheter tube used to drain urine on a one-time basis; a coude catheter, which is used as a male catheter and has an angle toward the end to move over a prostate, and a three-way catheter, which is used to flush out the bladder after surgery or trauma.

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Urinary Catheterization on wiseGEEK:

Sometimes damage to the nerves is so significant that people require regular urinary catheterization. Training on how to properly perform this under clean or sterile conditions is extremely valuable to prevent infection.

Placement of a catheter can be done by a doctor such as a urologist, an experienced nurse, or even the patient in the case of self catheterization. One of the main reasons to use a urinary catheter is to provide a patient with drainage because she or he cannot urinate.

External Catheter on wiseGEEK:

The two-piece catheter is applied with either silicone, adhesive strips, spray-on or brush-on adhesives or elasticized tape. Other types of external catheters include the adhesive urinary pouch, which is a pouch attached to the base of the penis and primarily is used for those with a retracted penis.

It is then attached to the penis using one of several methods. Sometimes this external catheter is secured using double-sided adhesive. Another way of securing the condom catheter to the penis is with a jockey-type strap or a foam strap.

from

http://www.wisegeek.com/what-is-a-condom-catheter....


Kaohsiung Veterans General Hospital 5 years ago

A condom catheter is a male urinary incontinence device consisting of a flexible sheath that fits over the penis just like a condom. The condom part is then attached to a tube that drains the urine into a urinary storage bag. These types of catheters are usually good for those individuals who suffer from male urinary incontinence due to a medical condition or advanced Alzheimer's disease.

The condom catheter is easy to use, since it is simply rolled onto the penis. It is then attached to the penis using one of several methods. Sometimes this external catheter is secured using double-sided adhesive. Another way of securing the condom catheter to the penis is with a jockey-type strap or a foam strap.

This external catheter needs to be changed every 24 to 48 hours. After removal, the penis and surrounding area should be cleansed thoroughly with soap and water. The area should then be dried completely before applying a new catheter. This is very important because if moisture is left inside the condom, it can allow bacteria to grow. These bacteria can cause a urinary tract infection.

On occasion, the adhesive used to attach the condom catheter may cause irritation to the shaft of the penis. If this happens, the condom catheter should not be used again until the skin irritation is gone. During this time, urinary incontinence pads or underwear will have to be used. Urine is irritating to the skin, so it is important the incontinence pads or underwear are changed frequently to avoid any damage to the skin.

Urinary drainage storage bags for the condom catheter come in various sizes to accommodate the activity level of the individual. For those men who are still active, there is a small drainage bag that can be attached to the upper thigh with straps. This bag is usually discreet, and it can easily be emptied into the toilet. Larger urinary bags are available for use at home. These bags are placed on the floor beside the patient or attached to the bottom of a chair.


Baylor Health Care System 5 years ago

An external catheter is a device that fits over the penis like a condom and is attached by a tube to a drainage bag used to collect urine leakage. The drainage bag is strapped to the leg. The catheter is used for men who deal with urinary incontinence and prefer not to use diapers or pads. The external catheter is also called a urinary sheath, condom catheter or penile sheath.

The external catheter is made from different materials, such as silicone, polyvinyl or rubber latex. It is attached by an adhesive that is either a part of the sheath or an adhesive or silicone that is applied to the penis before application. A strap can also be used to apply the catheter to the penis.

It does come in different sizes, and the size is important, because it must fit securely to avoid leakage. Most external catheters are disposable, although reusable catheters also are made for active men who suffer from incontinence. Disposable catheters should not be worn for longer than 24-48 hours.

There are several types of external catheters as well. In addition to disposable and reusable catheters, there are one- and two-piece catheters. The self-adhesive, one-piece catheter has adhesive as a part of the sheath and is easier to use and is more secure. The two-piece catheter is applied with either silicone, adhesive strips, spray-on or brush-on adhesives or elasticized tape.

Other types of external catheters include the adhesive urinary pouch, which is a pouch attached to the base of the penis and primarily is used for those with a retracted penis. Another type of external catheter used for a short or retracted penis has an adhesive seal that can be attached to the tip of the glans with a connector that is then attached to a collection system. There also is an inflatable catheter, which is simply a retention ring that is inflated to secure the catheter and then deflated to remove it.

The catheter should be removed daily by soaking the penis with a warm washcloth for 30 seconds. The skin should be inspected so that any problems can be addressed. Many men are able to wear an external catheter for 12-72 hours.

Although the external catheter is a safer option than an internal catheter because there is no tube insertion into the bladder, there still are some common problems that might be experienced. There is a slight chance of infection, although there is a smaller incidence than with an internal catheter. Skin irritation can be caused because of the friction of the catheter rubbing against the penis. There could be a restriction of blood flow to the penis, and penile obstruction also could occur.


Helse Midt Norge Rhf Regionalt Helseføretak 5 years ago

When selecting a catheter size it is important to consider the patient's body type, the procedure to be performed, and the potential risks involved. While catheter sizing depends on these and other variables, a good general rule is to select the smallest possible catheter that will work in the given procedure. Most physicians use a French 14-gauge, or 0.184 inches (about 4.7 mm), for adult males and a French 12- to 16-gauge, or 0.158 to 0.21 inches (about 4 to 5.3 mm), for adult females.

If there is a concern of excessive fluid flow, or of sediment such as blood clots, passing through the catheter, then the catheter should be slightly larger to accommodate these possibilities. These risks are often associated with urinary catheterization, or the use of a catheter to withdraw urine from the bladder. Problematic issues may also arise during some blood transfusions.

When selecting a catheter for a blood transfusion, the primary consideration should be the size of the patient's vein. Recent scientific developments have affected the sizing standards for blood transfusion catheters. While an 18-gauge, or a catheter measuring 0.234 inches (about 5.94 mm), used to be the standard, the development of short peripheral catheters with smaller but stronger walls made it possible to use a smaller size for a larger fluid flow. Now, physicians recommend that an 18- or 20-gauge, measuring 0.26 inches (about 6.6 mm), should only be used for large and rapid blood transfusions, such as in a trauma case.

Catheter length is dependent on the patient's body type and the intended procedure. A larger patient with greater body mass might need a longer catheter tube than a smaller patient with less body mass. Additionally, a male will need a longer urinary catheter than a female. Typically, urinary catheters for men are 16 inches (about 40 cm) long, while those for women are only about 6 inches (15 cm) long. In all cases, however, the following should be considered: a shorter catheter tube allows for a faster draw of fluid; a longer tube creates more resistance to the flow of fluid. For increased efficiency, a shorter catheter is recommended when possible.

In addition to choosing a catheter size, it is important to select a catheter made from material that will be safe with the fluids and body types involved in the procedure. Most catheters are made from silicone or polyurethane, which softens when warmed. Polyurethane is tougher, permitting the catheter wall to be thinner and the internal diameter larger than those made from silicone. For these reasons, using a polyurethane catheter can improve efficiency and reduce the risk of irritation to the body.

Catheterization of any part of the body is a delicate process. While minor irritation to the affected area is normal, anything more intense or extensive should be treated. Urinary tract infections due to prolonged catheterization are the most common infections among in-patients in hospitals. For this reason, close monitoring of catheterized patients is highly recommended for hospital staff. Self-catheterization is not recommended.


Texas Health Resources Inc. 5 years ago

What is Catheter Angiography?

Angiography is a minimally invasive medical test that helps physicians diagnose and treat medical conditions. Angiography uses one of three imaging technologies and, in some cases, a contrast material to produce pictures of major blood vessels throughout the body.

Angiography is performed using:

x-rays with catheters

computed tomography (CT)

magnetic resonance imaging (MRI)

In catheter angiography, a thin plastic tube, called a catheter, is inserted into an artery through a small incision in the skin. Once the catheter is guided to the area being examined, a contrast material is injected through the tube and images are captured using a small dose of ionizing radiation (x-rays).

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What are some common uses of the procedure?

Catheter angiography is used to examine blood vessels in key areas of the body, including the:

brain

kidneys

pelvis

legs

lungs

heart

neck

abdomen

Physicians use the procedure to:

identify disease and aneurysms in the aorta, both in the chest and abdomen, or in other major blood vessels.

detect atherosclerosis disease in the carotid artery of the neck, which may limit blood flow to the brain and cause a stroke.

identify a small aneurysm or arteriovenous malformation inside the brain.

detect atherosclerotic disease that has narrowed the arteries to the legs and help prepare for endovascular intervention or surgery.

detect disease in the arteries to the kidneys or visualize blood flow to help prepare for a kidney transplant.

guide interventional radiologists and surgeons making repairs to diseased blood vessels, such as implanting stents or evaluating a stent after implantation.

detect injury to one of more arteries in the neck, chest, abdomen, pelvis or extremities in trauma patients.

evaluate arteries feeding a tumor prior to surgery or other procedures such as chemoembolization or selective internal radiation therapy.

identify dissection or splitting in the aorta in the chest or abdomen or its major branches.

show the extent and severity of atherosclerosis in the coronary arteries and plan for a surgical operation, such as a coronary bypass and stenting.

sample blood from specific veins in the body to detect any endocrine disease.

examine pulmonary arteries in the lungs to detect pulmonary embolism (blood clots from leg veins).

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How should I prepare?

You should inform your physician of any medications you are taking and if you have any allergies, especially to barium or iodinated contrast materials. Also inform your doctor about recent illnesses or other medical conditions.

You may be asked to remove some or all of your clothes and to wear a gown during the exam. You may also be asked to remove jewelry, dentures, eye glasses and any metal objects or clothing that might interfere with the x-ray images.

Women should always inform their physician and x-ray technologist if there is any possibility that they are pregnant. Many imaging tests are not performed during pregnancy so as not to expose the fetus to radiation. If an x-ray is necessary, precautions will be taken to minimize radiation exposure to the baby. See the Safety page (www.RadiologyInfo.org/en/safety/) for more information about pregnancy and x-rays.

If you are breastfeeding at the time of the exam, you should ask your radiologist how to proceed. It may help to pump breast milk ahead of time and keep it on hand for use after contrast material has cleared from your body, about 24 hours after the test.

If you are going to be given a sedative during the procedure, you may be asked not to eat or drink anything for four to eight hours before your exam. Be sure that you have clear instructions from your health care facility.

If you are sedated, you should not drive for 24 hours after your exam and you should arrange for someone to drive you home. Because an observation period is necessary following the exam, you may be admitted to the hospital for an overnight stay if you live more than an hour away.

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What does the equipment look like?

Click to view larger

The equipment typically used for this examination consists of a radiographic table, an x-ray tube and a television-like monitor that is located in the examining room or in a nearby room. When used for viewing images in real time (called fluoroscopy), the image intensifier (which converts x-rays into a video image) is suspended over a table on which the patient lies. When used for taking still pictures, the image is captured either electronically or on film.

The catheter used in angiography is a long plastic tube about as thick as a strand of spaghetti.

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How does the procedure work?

Catheter angiography works much the same as a regular x-ray exam.

X-rays are a form of radiation like light or radio waves. X-rays pass through most objects, including the body. Once it is carefully aimed at the part of the body being examined, an x-ray machine produces a small burst of radiation that passes through the body, recording an image on photographic film or a special digital image recording plate.

Different parts of the body absorb the x-rays in varying degrees. Dense bone absorbs much of the radiation while soft tissue, such as muscle, fat and organs, allow more of the x-rays to pass through them. As a result, bones appear white on the x-ray, soft tissue shows up in shades of gray and air appears black.

When a contrast material is introduced to the bloodstream during the procedure, it clearly defines the blood vessels being examined by making them appear bright white.

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How is the procedure performed?

This examination is usually done on an outpatient basis.

A nurse or technologist will insert an intravenous (IV) line into a small vein in your hand or arm.

A small amount of blood will be drawn before starting the procedure to make sure that your kidneys are working and that your blood will clot normally. A small dose of sedative may be given through the IV line to lessen your anxiety during the procedure.

The area of the groin or arm where the catheter will be inserted is shaved, cleaned, and numbed with local anesthetic. The radiologist will make a small incision (usually a few millimeters) in the skin where the catheter can be inserted into an artery. The catheter is then guided through the arteries to the area to be examined. After the contrast material is injected through the catheter and reaches the blood vessels being studied, several sets of x-rays are taken. Then the catheter is removed and the incision site is closed by placing pressure on the area for approximately 10 to 20 minutes (or by using a special closure device).

When the examination is complete, you will be asked to wait until the radiologist determines that all the necessary images have been obtained.

Your intravenous line will be removed.

A catheter angiogram may be performed in less than an hour; however, it may last several hours.

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What will I experience during and after the procedure?

Prior to beginning the procedure, you will be asked to empty your bladder.

You will feel a slight pin prick when the needle is inserted into your vein for the intravenous line (IV).

Injecting a local anesthetic at the site where the catheter is inserted may sting briefly, but it will make the rest of the procedure pain-free.

You will not feel the catheter in your artery, but when the contrast material is injected, you may have a feeling of warmth or a slight burning sensation. The most difficult part of the procedure may be lying flat for several hours. During this time, you should inform the nurse if you notice any bleeding, swelling or pain at the site where the catheter entered the skin.

You may resume your normal diet immediately after the exam. You will be able to resume all other normal activities 8 to 12 hours after the exam.

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Who interprets the results and how will I get them?

A radiologist, a physician specifically trained to supervise and interpret radiology examinations, will analyze the images and send a signed report to your primary care or referring physician, who will discuss the results with you.

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What are the benefits vs. r


Dartmouth-Hitchcock Norris Cotton Cancer Center 5 years ago

Diagnostic sonography (ultrasonography) is an ultrasound-based diagnostic imaging technique used for visualizing subcutaneous body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions. Obstetric sonography is commonly used during pregnancy and is widely recognized by the public.

In physics, the term "ultrasound" applies to all acoustic energy (longitudinal, mechanical wave) with a frequency above the audible range of human hearing. The audible range of sound is 20 hertz-20 kilohertz. Ultrasound is frequency greater than 20 kilohertz.

Typical diagnostic sonographic scanners operate in the frequency range of 1 to 18 megahertz, though frequencies up to 50-100 megahertz has been used experimentally in a technique known as biomicroscopy in special regions, such as the anterior chamber of eye.[citation needed] The above frequencies are hundreds of times greater than the limit of human hearing, which is typically accepted as 20 kilohertz. The choice of frequency is a trade-off between spatial resolution of the image and imaging depth: lower frequencies produce less resolution but image deeper into the body.

Sonography (ultrasonography) is widely used in medicine. It is possible to perform both diagnosis and therapeutic procedures, using ultrasound to guide interventional procedures (for instance biopsies or drainage of fluid collections). Sonographers are medical professionals who perform scans for diagnostic purposes. Sonographers typically use a hand-held probe (called a transducer) that is placed directly on and moved over the patient.

Sonography is effective for imaging soft tissues of the body. Superficial structures such as muscles, tendons, testes, breast and the neonatal brain are imaged at a higher frequency (7-18 MHz), which provides better axial and lateral resolution. Deeper structures such as liver and kidney are imaged at a lower frequency 1-6 MHz with lower axial and lateral resolution but greater penetration.

Medical sonography is used in the study of many different systems:


Landstinget I Kalmar Lan Hospital of Vastervik 5 years ago

Ultrasonography, commonly called sonography, is a diagnostic medical procedure that uses high frequency sound waves (ultrasound) to produce dynamic visual images of organs, tissues, or blood flow inside the body. This type of procedure is often referred to as a sonogram or ultrasound scan. Sonography can be used to examine many parts of the body, such as the abdomen, breasts, female reproductive system, prostate, heart, and blood vessels. Sonography is increasingly being used in the detection and treatment of heart disease, heart attack, and vascular disease that can lead to stroke. It is also used to guide fine needle, tissue biopsy to assist in taking a sample of cells from an organ for lab testing (for example, a test for cancer in breast tissue). Unlike X-rays, sonography is a radiation-free imaging modality.

The non-physician professionals who perform these procedures are known as sonographers and vascular technologists (who are sonographers specializing in imaging and tests of blood vessels).

There are several areas of specialization in the field of sonography. These specialty areas are:

Abdomen - evaluation of all the soft tissues, blood vessels and organs of the abdominal cavities (for example, liver, spleen, urinary tract, pancreas)

Breast - frequently used to evaluate breast abnormalities that are found with screening or diagnostic mammography

Obstetrics/Gynecology - evaluation of the female reproductive system

Echocardiography - evaluation of the anatomy and hemodynamics (blood flow) of the heart, its valves and related blood vessels

Vascular Technology - evaluation and analysis of the hemodynamics (blood flow) of peripheral and abdominal blood vessels

Neurosonology - evaluation of the brain and spinal cord

Ophthalmology - evaluation of the eye, including orbital structures and muscles

What does a diagnostic medical sonographer do?

A diagnostic medical sonographer is a highly-skilled professional who uses specialized equipment to create images of structures inside the human body that are used by physicians to make a medical diagnosis. The process involves placing a small device called a transducer against the patient's skin near the body area to be imaged. The transducer works like a loudspeaker and microphone because it can transmit sound and receive sound. The transducer sends a stream of high frequency sound waves into the body that bounce off the structures inside. The transducer detects sound waves as they bounce off the internal structures. Different structures in the body reflect these sound waves differently. These sounds are analyzed by a computer to make an image of the structure(s) on a television screen or that can be recorded on videotape.

Sonographers have extensive, direct patient contact that may include performing some invasive procedures. They must be able to interact compassionately and effectively with people who range from healthy to critically ill.

The professional responsibilities include, but are not limited, to:

obtaining and recording an accurate patient history

performing diagnostic procedures and obtaining diagnostic images

analyzing technical information

using independent judgement in recognizing the need to extend the scope of the procedure according to the diagnostic findings

providing an oral or written summary of the technical findings to the physician for medical diagnosis

providing quality patient care

collaborating with physicians and other members of the health care team.

Sonographers must also be knowledgeable about and limit the risk from possible exposure to blood and body fluids. Many sonographers also assist in electronic and clerical scheduling, record keeping, and computerized image archiving. Sonographers may also have managerial or supervisory responsibilities.

What are some of the technical standards?

Sonographers and Vascular Technologists must be able to:

Lift more than 50 pounds routinely

Push and pull routinely

Bend and stoop routinely

Have full use of both hands, wrists and shoulders

Distinguish audible sounds

Adequately view sonograms, including color distinctions

Work standing on their feet 80% of the time

Interact compassionately and effectively with the sick or injured

Assist patients on and off examining tables

Communicate effectively with patients and other health care professionals

Organize and accurately perform the individual steps in a sonographic procedure in the proper sequence

What are the career opportunities?

Sonography is a dynamic profession that has grown significantly over the past 20 years. With rapidly developing new technologies and increased use of diagnostic ultrasound procedures, growth is projected to continue in the future with employment opportunities for qualified sonographers in both urban and rural areas nationwide. Sonographers and vascular technologists can choose to work in clinics, hospitals, private practice physician offices, public health facilities, laboratories, and other medical settings performing examinations in their areas of specialization. Career advancement opportunities exist in education, administration, research, and in commercial companies as education/application specialists, sales representatives, technical advisors, etc.

What are the salaries for sonographers?

In addition to excellent career opportunities, salaries for sonographers are competitive with or higher than other professionals with similar levels of education. According to the SDMS Salary and Benefits Survey report (released March, 2005), the median salary for sonographers is $61,984. This income includes: 1) hourly salary, 2) overtime and, 3) on-call pay. The typical hourly pay rate is $29, and the number of overtime hours worked per week by sonographers is 3. The typical on-call pay rate is $3.00 per hour, and the call-in rate of pay is $42 per hour. Note: The SDMS Salary and Benefits Survey report is available for free to all SDMS members.

Salaries vary depending on years of experience, number of specialties practiced, as well geographic location. There are opportunities for full-time and part-time employment.

How long does it take to become a diagnostic medical sonographer?

Comprehensive Diagnostic Medical Sonography programs vary in length from one to four years depending on the degree or certificate awarded. Prerequisites also vary among programs from high school diploma or GED to specific qualifications in a related allied health profession.

The SDMS recommends that prospective students select a reputable program that follows minimum curriculum and clinical education standards recognized by the American Registry of Diagnostic Medical Sonographers (ARDMS.) The SDMS does not recommend training programs that provide limited opportunity for students to apply classroom instruction and technical skills in patient care settings (clinical rotations). When seeking a reputable program, candidates might wish to consult the Commission on Accreditation of Allied Health Education Programs (CAAHEP) which accredits diagnostic medical sonography programs in the United States.

from

http://www.sdms.org/career/career.asp


Piedmont Hospital 5 years ago

Angiography or arteriography is a medical imaging technique used to visualize the inside, or lumen, of blood vessels and organs of the body, with particular interest in the arteries, veins and the heart chambers. This is traditionally done by injecting a radio-opaque contrast agent into the blood vessel and imaging using X-ray based techniques such as fluoroscopy. The word itself comes from the Greek words angeion, "vessel", and graphein, "to write or record". The film or image of the blood vessels is called an angiograph, or more commonly, an angiogram.

The term angiography is strictly defined as based on projectional radiography; however, the term has been applied to newer vascular imaging techniques such as CT angiography and MR angiography. The term isotope angiography has also been used, although this more correctly is referred to as isotope perfusion scanning.

History

The technique was first developed in 1927 by the Portuguese physician and neurologist Egas Moniz to provide contrasted x-ray cerebral angiography in order to diagnose several kinds of nervous diseases, such as tumors, coronary heart disease and arteriovenous malformations. He is usually recognized as one of the pioneers in this field. Moniz performed the first cerebral angiogram in Lisbon in 1927, and Reynaldo Cid dos Santos performed the first aortogram in the same city in 1929. With the introduction of the Seldinger technique in 1953, the procedure became markedly safer as no sharp introductory devices needed to remain inside the vascular lumen.

from

http://en.wikipedia.org/wiki/Angiography


NHS Greater Glasgow and Clyde 5 years ago

Depending on the type of angiogram, access to the blood vessels is gained most commonly through the femoral artery, to look at the left side of the heart and the arterial system or the jugular or femoral vein, to look at the right side of the heart and the venous system. Using a system of guide wires and catheters, a type of contrast agent (which shows up by absorbing the x-rays), is added to the blood to make it visible on the x-ray images.

The X-ray images taken may either be still images, displayed on an image intensifier or film, or motion images. For all structures except the heart, the images are usually taken using a technique called digital subtraction angiography (DSA). Images in this case are usually taken at 2 - 3 frames per second, which allows the radiologist to evaluate the flow of the blood through a vessel or vessels. This technique "subtracts" the bones and other organs so only the vessels filled with contrast agent can be seen. The heart images are taken at 15-30 frames per second, not using a subtraction technique. Because DSA requires the patient to remain motionless, it cannot be used on the heart. Both these techniques enable the radiologist or cardiologist to see stenosis (blockages or narrowings) inside the vessel which may be inhibiting the flow of blood and causing pain.

[edit]Uses

[edit]Coronary angiography

Main article: Coronary angiography

One of most common angiograms performed is to visualize the blood in the coronary arteries. A long, thin, flexible tube called a catheter is used to administer the x-ray contrast agent at the desired area to be visualized. The catheter is threaded into an artery in the forearm, and the tip is advanced through the arterial system into the major coronary artery. X-ray images of the transient radiocontrast distribution within the blood flowing within the coronary arteries allows visualization of the size of the artery openings. Presence or absence of atherosclerosis or atheroma within the walls of the arteries cannot be clearly determined. See coronary catheterization for more detail..

[edit]Microangiography

[Microangiography] is commonly used to visualize tiny blood vessels.

[edit]Neuro-vascular angiography

Another increasingly common angiographic procedure is neuro-vascular digital subtraction angiography in order to visualise the arterial and venous supply to the brain. Intervention work such as coil-embolisation of aneurysms and AVM gluing can also be performed.

[edit]Peripheral angiography

Main article: Peripheral artery occlusive disease

Angiography is also commonly performed to identify vessel narrowing in patients with leg claudication or cramps, caused by reduced blood flow down the legs and to the feet; in patients with renal stenosis (which commonly causes high blood pressure) and can be used in the head to find and repair stroke. These are all done routinely through the femoral artery, but can also be performed through the brachial or axillary (arm) artery. Any stenoses found may be treated by the use of atherectomy.

[edit]Other

Other angiographic uses include the diagnosis of retinal vascular disorders, such as diabetic retinopathy and macular degeneration.

[edit]Complications

[edit]Coronary angiography

Coronary angiographies are common and major complications are rare. These include Cardiac arrhythmias, kidney damage, blood clots (which can cause heart attack or stroke), hypotension and pericardial effusion. Minor complications can include bleeding or bruising at the site where the contrast is injected, blood vessel damage on the route to the heart from the catheter (rare) and allergic reaction to the contrast.[1]

[edit]Cerebral angiography

Major complications in Cerebral Angiography are also rare but include stroke, an allergic reaction to the anaesthetic other medication or the contrast medium, blockage or damage to one of the access veins in the leg, or thrombosis and embolism formation. Bleeding or bruising at the site where the contrast is injected are minor complications, delayed bleeding can also occur but is rare.


Virginia Commonwealth University Health System 5 years ago

Arteriography is a procedure which is used to create an image of the inside of the arteries. This medical imaging technique is used in the diagnosis and monitoring of a number of conditions which involve narrowing or occlusions in the arteries. It can be performed in a hospital, clinic, or radiology clinic, and is typically an outpatient procedure, although it can also be used on hospitalized patients who will be remaining in the hospital after the procedure to manage ongoing medical problems.

lso known as angiography, arteriography involves the injection of a contrast dye into the area of interest. The dye will show up clearly on x-rays, allowing a doctor or radiologist to follow the movement of the dye through the arteries. The path of the dye can reveal occlusions or blockages in the arteries, along with the narrowing of arteries, and other problems, such as malformations which could cause problems for the patient.

In this procedure, the patient wears a hospital gown and lies on an x-ray table. With the assistance of fluoroscopy, a catheter is threaded into the body, usually through the femoral artery, and directed to the area of interest. Once in place, contrast dye is injected, and a series of x-rays are taken. After the procedure is finished, the patient is free to go, although he or she may be asked to stay for monitoring to confirm that no negative reactions are occurring.

Potential complications of an arteriography procedure include an allergic reaction to the dye, occlusion of an artery, or damage to the kidneys. A doctor will usually screen a patient before conducting the test to confirm that it will be safe, and intervention will be provided promptly if signs of complications emerge while the patient is in the hospital or clinic. Most patients also experience temporary flushing as a result of the contrast agent. They may be given sedatives during the procedure to keep them calm so that the images are not compromised.

Some examples of common arteriography procedures including cerebral, coronary, lower extremity, and renal arteriography, all named for the areas of interest studied during the procedure. The resulting arteriograms can be evaluated by a radiologist and a physician to determine what the patient's situation is. Treatment recommendations may be made to manage an obvious problem, or a patient may be encouraged to get additional testing to provide more information for the doctor.

from

http://www.wisegeek.com/what-is-arteriography.htm


Palmetto Health 5 years ago

Definition of Femoral Artery: the chief artery of the thigh; a continuation of the external iliac artery

Femoral Artery on wiseGEEK:

Vital to the vascular survival of a person, if cut, an average person will typically bleed to death within 10 or 15 minutes without immediate medical intervention. Whenever the femoral artery is injured, it becomes a life and death situation instantaneously.

The arteries that may be involved in a femoral-tibial bypass include the femoral artery, the popliteal artery, and the tibial arteries. The femoral artery is a superficial artery that begins in the groin and runs down the upper leg.

Peripheral Vascular on wiseGEEK:

When the arteries leading to the extremities become blocked, doctors diagnose PVD. Symptoms of Peripheral Vascular Disease include pain and weakness in the extremities.

It is classified as a type of arteriosclerosis, because it is caused by a narrowing of the arteries resulting in decreased blood flow. It is also known as peripheral vascular disease (PAD), in reference to the vascular system of veins and arteries which supplies blood to the body.

Definition of Arteriography: roentgenographic examination of arteries

Arteriography on wiseGEEK:

They may be given sedatives during the procedure to keep them calm so that the images are not compromised. Some examples of common arteriography procedures including cerebral, coronary, lower extremity, and renal arteriography, all named for the areas of interest studied during the procedure.

Administered tests may include magnetic resonance angiography (MRA), Doppler ultrasound, and renal arteriography. Blood tests may also be performed to evaluate hormone and protein levels and check for any markers indicative of kidney dysfunction.

Definition of Arteriogram: an X ray of an artery filled with a contrast medium

Arteriogram on wiseGEEK:

Some examples of common arteriography procedures including cerebral, coronary, lower extremity, and renal arteriography, all named for the areas of interest studied during the procedure. The resulting arteriograms can be evaluated by a radiologist and a physician to determine what the patient's situation is.

There are essentially four types of vascular imaging used with medical facilities today: arteriogram, ultrasound, magnetic resonance (MR) angiography, and computed tomography (CT) angiography.

Stenting on wiseGEEK:

They are generally instructed to rest for several days and take blood pressure-regulating medication. While carotid artery stenting is generally very successful, it is still possible for cholesterol to build up in the heart or another major blood vessel.

A ureteral stent is a thin tube inserted via a surgical procedure into one of the ureters for the purpose of draining urine from the kidney to the bladder. Stenting is primarily necessary when there is an obstruction found in one of the ureters, but it also can be used as a tool to aid surgical procedures in that area of the body.

Arteriography Procedure on wiseGEEK:

They may be given sedatives during the procedure to keep them calm so that the images are not compromised. Some examples of common arteriography procedures including cerebral, coronary, lower extremity, and renal arteriography, all named for the areas of interest studied during the procedure.

A physician may be able to reveal preliminary results immediately following the procedure. The results of the angiography will determine if additional treatment will be needed for a disclosed cardiovascular condition.


Baby Center 5 years ago

The spectrum of vascular therapy options runs from mild lifestyle changes to major surgery. In addition to lifestyle changes like a healthy diet and exercise, other ways to treat vascular issues include a variety of medications, angioplasty, and bypass surgery. Oftentimes, treatment involves a combination of options.

Lifestyle changes recommended for vascular therapy include stopping smoking, losing weight, getting regular exercise, eating a healthy diet, and managing stress. Moreover, monitoring and managing underlying health issues can play an important role in vascular health. For example, a patient who brings his diabetes under control and lowers his cholesterol will be lowering his risk of heart attack.

Doctors often prescribe daily aspirin to treat vascular problems because aspirin makes it harder for blood to clot. This means that blood can more easily pass through narrowed arteries. Other medications used in vascular therapy include statins to lower blood cholesterol, and nitrates and and beta blockers to help blood vessels relax.

Angioplasty is a non-surgical vascular therapy treatment that helps widen arteries in the heart that are narrowed or blocked. Also called percutaneous coronary intervention, angioplasty involves temporarily threading a tiny balloon through the femoral artery to the site of the trouble. The balloon is expanded to widen the the artery. Oftentimes a stent, a small wire device, is implanted during the angioplasty to help keep the artery open.

Blood clots in the leg and blood clots in the lung are often treated in similar ways. In life-threatening situations, clot-busting medication called thrombolytics may be given intravenously. In less severe cases, doctors often use anticoagulants, also called blood thinners. Blood thinners do not break up clots; they are used to help prevent new clots from forming or keep the existing clot from growing. Initially, the treatment may be given via injection or intravenously. Oral medication is then usually prescribed for a number of months.

In addition to taking anticoagulant medication, a patient with deep vein thrombosis may be told to elevate the leg whenever possible, to wear compression stockings from the foot to the knee, and to get up and walk around frequently. Elevation, compression, and walking are helpful in reducing the pain and swelling that many patients experience.

Another treatment involves the insertion of a filter into the vena cava in the abdomen. This filter is made up of thin spokes that prevent a traveling clot from working its way to the lungs. If a large clot is present in the lung, doctors have the option of removing it via a catheter threaded through blood vessels.

Coronary artery bypass surgery is perhaps the most invasive type of vascular therapy. It works by going around a blocked heart artery or arteries. A healthy vessel from the patient's arm, leg, chest, or abdomen is grafted to the aorta and the blocked artery. The vessel graft restores blood flow because it allows the blood to bypass the blocked part of the artery. A bypass procedure is considered major surgery. The patient is placed on a heart-lung machine which does the work of the patient's heart and lung during the several hours that this surgery takes. Typically the patient's sternum is broken to provide surgical access to the heart. Occasionally, laser surgery is used in conjunction with bypass to reach certain areas of blockage.

from

http://www.wisegeek.com/what-are-the-different-typ...


University of California San Diego Medical Center 5 years ago

Vascular function is vital for optimal health and there are several ways to improve the performance and function of your vascular system. For example, vascular function may be improved by giving up cigarette smoking, which is damaging to your cardiovascular health and may cause cancer. Proper blood circulation is essential for proper vascular function, and if you sit or lie down for long periods at a time, your blood vessels may not be receiving the adequate circulation needed. Therefore it is recommended to receive daily exercise to increase blood flow, especially to your legs.

Some other ways of increasing your vascular function may include keeping your weight in check. If you are overweight, try to maintain a proper weight through a nutritional and exercise program that works for you. Being overweight can lead to vascular problems, as it puts excess strain on blood vessels.

Hypertension can lead to many complications, one of them being cardiovascular. For improved vascular health, monitor your blood pressure regularly. If you notice an increase in blood pressure above 140/90, talk to your physician. He may recommend medication to lower your blood pressure. Regular exercise and a modified diet may help improve vascular function in such a case.

It is said that folic acid can provide vascular benefits. Experts believe folic acid stimulates blow flow to main arteries of the heart. In fact, many female athletes have taken folic acid to improve their vascular function and boost their performance and stamina in their sport. Before beginning any type of supplement therapy, you should consult with a physician.

To maintain a healthy vascular system, you need to be sure that proper circulation is being distributed throughout your body. In addition to daily walking and exercise, there are other ways to achieve this. One negative habit you may want to stop is crossing your legs. This may decrease circulation in your legs to a degree.

Also, if you do yard work, or other types of activities that require you to kneel for a long period of time, take frequent breaks. Get up and move around in between sessions. Any activity that puts excessive pressure on an area of your body, such as an arm or leg may reduce circulation. If you feel numbness for example, you need to stretch, move around, or massage the area to increase blood flow.

Some experts believe there are beneficial properties in chocolate and cocoa that may improve vascular health and function. Consuming such foods in moderation may improve your vascular function. Also, coenzyme Q10 is another essential ingredient for healthy blood cells and cardiovascular system. You may want to ask your health care provider if taking a supplement can benefit you.

from

http://www.wisegeek.com/how-do-i-improve-vascular-...


Provena Health 5 years ago

Vascular tone is a medical term used to describe the diameter and tone of a blood vessel when the vessel is fully dilated. Under normal conditions, all blood vessels experience at least a mild degree of contraction of the smooth muscles of the vessel. These contractions are used to determine vascular tone. When this tone is normal, the blood vessels are considered to be functioning at optimal levels. When these contractions become abnormal, vascular health may become compromised, requiring a trip to a medical professional for proper diagnosis and treatment.

Both types of blood vessels, arteries and veins, are considered when measuring vascular tone. An artery is a blood vessel which carries clean blood from the heart to the various tissues and organs of the body. A vein is a type of blood vessel responsible for transporting blood back to the heart after the tissues and organs have obtained the oxygen and nutrients from the blood.

Vascular tone naturally differs among organs. This is due to the differences in vasodilatory capacity. This means that the organs receiving a faster flow of blood will have a higher vascular tone than the organs receiving a slower flow of blood. The myocardium, for instance, is the thickest of the heart muscles and has a high vascular tone. On the contrary, the kidneys and other renal organs have a much lower vascular tone.

While there are several factors which can have an effect on vascular tone, these factors are generally divided into two categories. Extrinsic factors are those which begin outside of the tissue or organ where the blood vessel is found, such as blood flow regulation by the sympathetic nerves. Intrinsic factors are those which begin either in the actual blood vessel itself or in tissues immediately surrounding the vessel; chemicals or hormones produced by an organ that affect blood flow or blood pressure are intrinsic factors.

Certain medical conditions, including heart disease or high blood pressure, have the potential of causing vascular tone dysfunction. When this type of dysfunction is suspected, medical intervention becomes very important. Routine medical testing is often able to detect a problem before it turns into a life-threatening situation. In many cases, a combination of dietary changes and prescription medications are sufficient to restore proper vascular health. Surgical intervention sometimes becomes necessary, depending upon the patient's overall health.


Montefiore Medical Center 5 years ago

A bladder rupture is usually seen in the context of significant trauma and can be divided into three broad types :

extra-peritoneal bladder rupture

intra-peritoneal bladder rupture

combined bladder rupture

Extraperitoneal bladder rupture

Extraperitoneal rupture is the most common type of bladder injury accounting for 80 - 90% of cases. It is usually the result of pelvic fractures or penetrating trauma.

Cystography reveals a variable path of extravasated contrast material.

Intraperitoneal bladder rupture

Occurs in approximately 10 - 20% of major bladder injuries, and typically is the result of a direct blow to the already distended bladder.

Cystography demonstrates intraperitoneal contrast material around bowel loops, between mesenteric folds, and in the paracolic gutters

Combined bladder rupture

Simultaneous intraperitoneal and extraperitoneal injury.

Cystography usually demonstrates extravasation patterns that are typical for both types of injury.

from

http://radiopaedia.org/articles/bladder-rupture


Nemocnice na Homolce 5 years ago

The isotope renogram offers a simple and safe method of studying the passage of urine from kidney to bladder. By this technique it can be shown that urine flow down the ureter is often irregular. Transient episodes of complete or partial interruption of ureteric urine flow on one or both sides are common in patients with anatomically normal urinary tracts. A study of 200 patients with otherwise normal renograms showed that such changes were detectable in 75% of cases. The duration of the longest observed period of urine hold-up was sometimes considerable, being over 150 seconds in 28 patients (14%). The majority of these 28 subjects had no pathological or radiological evidence of renal or urinary-tract disease. There was, however, a striking clinical similarity in 14 cases, all but 1 being women. There was a story of recurrent attacks of loin pain, urgency, and frequency, without any consistent laboratory evidence of urinary-tract infection. 4 patients had undergone repeatedly negative hospital investigations for suspected pyelonephritis or renal colic for over twenty years. The symptoms in these patients may be due to contractions of the ureters and trigone, associated with a temporary hold-up of ureteric urine flow—a functional condition analogous to spastic colon.

from

http://www.thelancet.com/journals/lancet/article/P...


Seattle Cancer Care Alliance, WA 5 years ago

The purpose of this study was to assess the accuracy of Duplex scanning in detecting renovascular disease and to compare it with angiography, renal scintigraphy and captopril test for plasma renin activity and isotopic renography. A Duplex scan was performed in 92 renal arteries (46 patients) and compared to angiography. Three degrees of stenoses were established: 0-60%, 61-99% and occlusion. The peak systolic velocity (PSV) in the renal artery and its ratio to the peak velocity in the aorta (RAR) were used to discriminate stenoses > 60%. PSV in the interlobar arteries was used to assess the relative perfusion of both parenchyma. Angiography demonstrated a stenoses > 60% in 23 hypertensive patients. In all of the patients, plasma renin activity was measured and isotopic renograms (pre- and post-captopril) obtained in order to discriminate hypertension of vascular origin. A PSV in the renal artery > 210 cm/s and a RAR > 3.5 were found to be the diagnostic criteria with the best sensitivity and specificity in detecting stenoses > 60%. Based on these data, Duplex correctly identified 49/54 stenoses > 60%; 28/33 stenoses < 60%; and 5/5 occlusions (kappa 0.79). Sensitivity and specificity in detecting stenoses > 60% were 89.5 and 90.7%, respectively. The ratio between PSV in the interlobar arteries of both parenchyma accurately predicted the relative perfusion (ratio between DTPA uptake in both kidneys) in the isotopic test (n = 23, r = 0.91, p = 0.001). The captopril test (for plasma renin activity and isotopic renography) was positive in only five patients.(ABSTRACT TRUNCATED AT 250 WORDS)

from

http://www.biomedsearch.com/nih/Renal-duplex-scann...


Henry Ford Hospital 5 years ago

Isotope renography is a commonly used investigation for the detection of renal artery stenosis (RAS) in hypertensive patients, although its predictive accuracy is poor in an unselected population with a low prevalence of RAS. The aim of the present study was to identify characteristics of hypertensive patients that raise the clinical suspicion of underlying RAS, and which are predictive of an abnormal isotope renogram. The characteristics of 75 patients who had undergone either conventional or ACE-inhibitor-enhanced renography were retrospectively assessed and correlated with the renogram results. The presence of a raised serum creatinine, severe systolic hypertension at presentation and the requirement for triple drug therapy best predicted abnormalities on renography. However, it would appear that the false-positive rate of this investigation is high and its predictive accuracy is poor even in a highly selected group of patients. We conclude that isotope renography is of no practical value in the screening of hypertensive patients for RAS. Renal angiography remains the investigation of choice.

from

http://www.ncbi.nlm.nih.gov/pubmed/7917795


Alberta Health & Wellness 5 years ago

sotope renograms, using radiohippuran, were carried out in a series of 569 hypertensive patients. In 20 patients with active renal artery stenosis, i.e. with renal ischaemia, three types of renogram abnormality were found: the C type of curve, in which there was a delay in the fall of radioactivity during the excretory phase, was present in nine patients; seven patients had a B type of curve in which there was a lowering of the peak level of radioactivity with a delay in fall during the excretory phase; and four had an A type of curve, in which there was a reduced vascular spike with flattening of the secretory and excretory phases.

The effect of hydration and dehydration on the renogram pattern is described, and the relationship between the renogram pattern and the severity of stenosis together with renal parenchymal changes discussed. The value of the renogram in the assessment of the significance of a renal artery stenosis demonstrated by aortography, and its value in the follow-up of patients following reconstructive vascular surgery is discussed. It is pointed out that misleading results may be obtained in segmental ischaemia, bilateral stenosis, and where an unrelated renal lesion coexists with a renal artery stenosis.

In conclusion, it is suggested that the isotope renogram, when used in conjunction with an intravenous pyelogram, is a safe and effective screening procedure for use in the detection of renovascular hypertension.

from

http://qjmed.oxfordjournals.org/content/35/2/237.a...


Barnes Jewish Hospital 5 years ago

Retrograde Urethrography

Definition

Retrograde urethrography involves the use of x-ray pictures to provide visualization of structural problems or injuries to the urethra.

Purpose

Retrograde urethrography is used, in combination with a doctor's observation and other tests, to establish a diagnosis for individuals, almost exclusively men, who may have structural problems of the urethra.

Precautions

The doctor should be made aware of any previous history of reactions to shellfish, iodine, or any iodinecontaining foods or dyes. An earlier allergic reaction during a dye study is not necessarily something that makes the test inadvisable (a contraindication) as no dye is injected into the bloodstream for this study. Other conditions that should be considered by the physician before the test is done include pregnancy, recent urethral surgery, or severe inflammation of the urethra, bladder, or prostate.

Description

The urethra is first visually examined by the doctor, and the opening is cleansed with an antiseptic solution. A flexible rubber or plastic catheter is then inserted into the urethra, and dye is injected into the catheter. A clamp is applied to hold the dye in place while x-ray pictures are taken of the urethral structure. The clamp and catheter are then removed. The procedure takes approximately 15 minutes. However, the patient may be asked to wait while films are developed, which also permits the patient to be observed for any immediate side effects from the dye. The test may be performed in a hospital, doctor's office, outpatient center, or freestanding surgical facility. The time involved for reporting of test results to the doctor may vary from a few minutes to a few days.

Preparation

The patient will be asked to sign a consent form after the risks and benefits of the procedure have been explained. No diet or activity changes are necessary in preparation for the procedure. The patient will be asked to remove all clothing and put on a surgical gown before the test begins.

Normal results

The presence of no anatomical or functional abnormalities is considered a normal result.

Abnormal results

Abnormal findings may indicate:

congenital abormalities

fistulas or false passages

lacerations

strictures

valves, known as "posterior urethral valves"

tumors

Resources

Organizations

American Kidney Fund (AKF). Suite 1010, 6110 Executive Boulevard, Rockville, MD 20852. (800) 638-8299. http://216.248.130.102/Default.htm.

National Kidney Foundation. 30 East 33rd St., New York, NY 10016. (800) 622-9010. http://www.kidney.org.

Key terms

Bladder — The balloonlike organ in the lower abdomen that holds urine.

Catheter — Tube used to inject into or withdraw fluids from the bladder.

Renal — Relating to the kidneys, from the Latin word for kidneys, renes.

Urethra — Tube that carries the urine from the bladder out of the body.

Visualization — The process of making an internal organ visible. A radiopaque subtance is introduced into the body, then an x-ray picture of the desired organ is taken.

Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

retrograde urethrography,

radiographic examination of the urethra after suspicion of obstruction of its external orifice and injection of contrast material that travels in a retrograde direction towards the bladder. It is used for evaluation of strictures, diverticula, and trauma.

Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.

urethrography

radiography of the urethra.

prostatic urethrography

the contrast material is delivered by catheter to the area of the prostate.

retrograde urethrography

the contrast medium is injected into the terminal part of the urethra which has been occluded by a Foley catheter.

voiding urethrography

contrast medium is injected into the urinary bladder and radiographs are taken as it is forced into the urethra.

from

http://medical-dictionary.thefreedictionary.com/re...


Azienda Sanitaria Locale di Viterbo 5 years ago

PURPOSE: We determined the relative sensitivity of double balloon positive pressure urethrography and voiding cystourethrography for diagnosing urethral diverticula in women, and for evaluating which presenting symptoms should be considered clinically suspicious for even smaller diverticula.

MATERIALS AND METHODS: The series comprised 32 women, including those with new onset urinary tract infections not related to intercourse, menopause or catheters, those with urethral symptoms, such as point urethral tenderness or a mass, urethral pain, dysuria, dyspareunia or post-void dribbling, and those with new onset urgency and frequency. All patients underwent a history and physical examination by the same physician. Each patient underwent double balloon urethrography and voiding cystourethrography on the same day at a single radiology department.

RESULTS: Of the 32 women 30 (94%) were diagnosed with at least 1 diverticulum by double balloon urethrography. In 22 of these cases voiding cystourethrography failed to show the diverticulum. Only 11 of these patients (37%) had a palpable mass on clinical examination. The most common presenting symptoms in patients diagnosed with a diverticulum were recurrent urinary tract infection (52%), dysuria (52%), urgency (41%), frequency (38%), stress incontinence (38%) and urge incontinence (34%). Only 3 patients (9%) presented with 1 symptom. Diverticulectomy was performed in 16 patients. Double balloon urethrography had greater sensitivity (100%) than voiding cystourethrography (44%) relative to a confirmed surgical diagnosis (z test p = 0.002). Of 9 diverticula missed by voiding cystourethrography in the surgery group the maximum diameter was less than 15 mm. in 5. Average followup in the surgery cases is 34 months (median 35, range 17 to 50). None of these patients has had new symptoms suggestive of recurrent diverticulum, failure, new urethritis or new stress urinary incontinence. Conservative therapy consisted of long-term antibiotics in 6 patients and symptomatic treatment with short-term antibiotics in the remaining 8. Conservative therapy offered symptomatic relief in most cases but did not prevent recurrent symptoms.

CONCLUSIONS: A diverticulum should be suspected in patients with new onset urinary tract infection, urgency and frequency as well as dyspareunia, post-void dribbling and dysuria. Double balloon urethrography is a more sensitive diagnostic test than voiding cystourethrography for diagnosing urethral diverticula. Patients with mild symptoms may be treated with conservative therapy, although we believe that satisfactory long-term treatment of diverticula is best achieved by surgical excision.

from

http://www.ncbi.nlm.nih.gov/pubmed/10569571


Haydarpasa Gata Arastirma Hastanesi 5 years ago

contrast

radiographically the degree of perceptible difference between two color tones. Black and white images on the one film is said to be high contrast; an all gray film has low or nil contrast.

contrast agents

contrast agents are used for injection into the vascular system for either a local visualization of a system or organ or for outlining an excretory system. Radiolucent (negative) contrast media are gases such as air, oxygen or carbon dioxide. The radiopaque (positive) contrast media include the insoluble salt barium sulfate and a variety of organic iodine compounds.

Barium is used for gastrointestinal studies. Water-soluble, iodinated contrast media excreted by the kidneys are used for many procedures, including all types of angiography and for intravenous and retrograde urography. Those excreted by the liver are used for oral or intravenous cholangiography or cholecystography. New, nonirritant iodine compounds have been developed for myelography. Oily iodinated media are used for lymphangiography and bronchography.

double contrast

the use of two contrast agents or two routes of administration in the one patient. For example, radiopaque dye and then air in the urinary bladder.

contrast materials

see contrast agents (above).

contrast medium

a substance used in radiography to permit visualization of internal body structures. Called also contrast agent, contrast material.

negative contrast

a contrast material that is not radiopaque such as air or carbon dioxide.

contrast pattern

the pattern made by the contrast agent. Includes confined extension patterns in diverticula and similar confined spaces, and unconfined extensions, e.g. in bladder rupture.

positive contrast

the use of a contrast material that is radiopaque such as barium sulfate and iodinated products.

triple contrast

the use of three contrast media or routes in the one patient at the one time.

water-soluble contrast agents

agents used for injection into the vascular system for either a local visualization of a system or organ or for outlining an excretory system. In the past these have consisted mostly of iodine preparations which are irritant and cause tissue damage so that they must be injected intravenously. However, there are now available some recently developed water-soluble iodine preparations that are nonirritant and which can be used in myelography

from

http://medical-dictionary.thefreedictionary.com/co...


NHS Lothian 5 years ago

In urinary catheterization, or "cathing" for short, a plastic tube known as a urinary catheter that is gently slid into a patient's bladder via his or her urethra. Catheterization allows the patient's urine to drain freely from the bladder for collection, or to inject liquids used for treatment or diagnosis of bladder conditions. The procedure of catheterization will usually be done by a clinician, often a nurse, although self-catheterization is possible as well.

Catheter types

Catheters come in several basic designs:[1]

A Foley catheter (indwelling urinary catheter)is retained by means of a balloon at the tip which is inflated with sterile water. The balloons typically come in two different sizes: 5 cc and 30 cc. They are commonly made in silicone rubber or natural rubber.

A Robinson catheter is a flexible catheter used for short term drainage of urine. Unlike the Foley catheter, it has no balloon on its tip and therefore cannot stay in place unaided.

A Coudé catheter is designed with a curved tip that makes it easier to pass through the curvature of the prostatic urethra.

A hematuria (or haematuria) catheter is a type of Foley catheter used for Post-TURP hemostasis. This is useful following endoscopic surgical procedures or in the case of gross hematuria. There are both 2-way and 3-way hematuria catheters (double and triple lumen).[1]

An external Texas or condom catheter is used for incontinent males and carries a lower risk of infection than an indwelling catheter.[2]

Catheter diameters are sized by the French catheter scale (F). The most common sizes are 10 F (3.3mm) to 28 F (9.3mm). The clinician selects a size large enough to allow free flow of urine, and large enough to control leakage of urine around the catheter. A larger size can become necessary when the urine is thick, bloody or contains large amounts of sediment. Larger catheters, however, are more likely to cause damage to the urethra. Some people develop allergies or sensitivities to latex after long-term latex catheter use making it necessary to use silicone or Teflon types. Silver alloy coated urinary catheters may reduce infections.[3]

[edit]Sex differences

In males, the catheter tube is inserted into the urinary tract through the penis. A condom or Texas catheter can also be used[clarification needed]. In females, the catheter is inserted into the urethral meatus, after a cleansing using povidone-iodine. The procedure can be complicated in females due to varying layouts of the genitalia (due to age, obesity, Female genital cutting, childbirth, or other factors), but a good clinician should rely on anatomical landmarks and patience when dealing with such a patient. In the UK it is generally accepted that cleaning the area surrounding the urethral meatus with 0.9% sodium chloride solution is sufficient for both male and female patients as there is no reliable evidence to suggest that the use of antiseptic agents reduces the risk of urinary tract infection.[4] Males may have a slightly higher incidence of Bladder Spasms. If bladder spasms occur or there is no urine in the drainage bag, the catheter may be blocked by: blood; thick sediment; a kink in the catheter or drainage tubing. Sometimes spasms are caused by the catheter irritating the bladder, prostate or penis. Such spasms can be controlled with medication such as Butylscopolamine, although most patients eventually adjust to the irritation and the spasms go away.[5]

Common indications to catheterize a patient include acute or chronic urinary retention - (which can damage the kidneys), orthopedic procedures that may limit a patient's movement, the need for accurate monitoring of input and output (such as in an ICU), benign prostatic hyperplasia, incontinence, and the effects of various surgical interventions involving the bladder and prostate.

For some patients the insertion and removal of a catheter causes excruciating pain, so a topical anesthetic is used. Catheterization should be performed as a sterile medical procedure and should only be done by trained, qualified personnel, using equipment designed for this purpose, except in the case of intermittent self catheterization where the patient has been trained to perform the procedure himself or herself. If correct technique is not used there may be trauma to the urethra or prostate (male), urinary tract infection, or a paraphimosis in the uncircumcised male.

[edit]Catheter maintenance

A catheter that is left in place for more than a short period of time is generally attached to a drainage bag to collect the urine. This also allows for measurement of urine volume. There are two types of drainage bags: The first is a leg bag, a smaller drainage device that attaches by elastic bands to the leg. A leg bag is usually worn during the day, as it fits discreetly under pants or skirts, and is easily emptied into a toilet. The second type of drainage bag is a larger device called a down drain that may be used overnight. This device is hung on a hook under the patient's bed - they are never to be placed on the floor due to the risk of bacterial infection.

During long-term use, the catheter may be left in place during the entire time, or a patient may be instructed on a procedure for placing a catheter just long enough to empty the bladder and then removing it (known as intermittent self-catheterization). Patients undergoing major surgery are often catheterized and may remain so for some time. The patient may require irrigation of the bladder with sterile saline injected through the catheter to flush out clots or other matter that does not drain.[6]

[edit]Effects of long term use

The duration of cathetarization can have significance for the patient. Incontinent patients commonly are catheterized to reduce their cost of care. However, long-term catheterization carries a significant risk of urinary tract infection. Because of this risk catheterization is a last resort for the management of incontinence where other measures have proved unsuccessful. Other long term complications may include blood infections (sepsis), urethral injury, skin breakdown, bladder stones, and blood in the urine (hematuria). After many years of catheter use, bladder cancer may also develop.

[edit]Combating infection

Everyday care of catheter and drainage bag is important to reduce the risk of infection.[7] Such precautions include:

Cleansing the urethral area (area where catheter exits body) and the catheter itself.

Disconnecting drainage bag from catheter only with clean hands

Disconnecting drainage bag as seldom as possible.

Keeping drainage bag connector as clean as possible and cleansing the drainage bag periodically.

Use of a thin catheter where possible to reduce risk of harming the urethra during insertion.

Drinking sufficient liquid to produce at least two liters of urine daily

Sexual activity is very high risk for urinary infections, especially for catheterized women.

Recent developments in the field of the temporary prostatic stent have been viewed as a possible alternative to indwelling catheterization and the infections associated with their use

from

http://en.wikipedia.org/wiki/Urinary_catheterizati...


Keesler Afb Medical Care 5 years ago

Introduction

The ability to insert a urinary catheter is an essential skill in medicine.

Catheters are sized in units called French, where one French equals 1/3 of 1 mm. Catheters vary from 12 (small) FR to 48 (large) FR (3-16mm) in size.

They also come in different varieties including ones without a bladder balloon, and ones with different sized balloons - you should check how much the balloon is made to hold when inflating the balloon with water!

Universal precautions

The potential for contact with a patient's blood/body fluids while starting a catheter is present and increases with the inexperience of the operator. Gloves must be worn while starting the Foley, not only to protect the user, but also to prevent infection in the patient. Trauma protocol calls for all team members to wear gloves, face and eye protection and gowns.

Indications

Contraindications

Equipment

Procedure

Complications

Indications

By inserting a Foley catheter, you are gaining access to the bladder and its contents. Thus enabling you to drain bladder contents, decompress the bladder, obtain a specimen, and introduce a passage into the GU tract. This will allow you to treat urinary retention, and bladder outlet obstruction.

Urinary output is also a sensitive indicator of volume status and renal perfusion (and thus tissue perfusion also).

In the emergency department, catheters can be used to aid in the diagnosis of GU bleeding.

In some cases, as in urethral stricture or prostatic hypertrophy, insertion will be difficult and early consultation with urology is essential.

Contraindications

Foley catheters are contraindicated in the presence of urethral trauma. Urethral injuries may occur in patients with multisystem injuries and pelvic factures, as well as straddle impacts. If this is suspected, one must perform a genital and rectal exam first. If one finds blood at the meatus of the urethra, a scrotal hematoma, a pelvic fracture, or a high riding prostate then a high suspicion of urethral tear is present. One must then perform retrograde urethrography (injecting 20 cc of contrast into the urethra).

Equipment

Sterile gloves - consider Universal Precautions

Sterile drapes

Cleansing solution e.g. Savlon

Cotton swabs

Forceps

Sterile water (usually 10 cc)

Foley catheter (usually 16-18 French)

Syringe (usually 10 cc)

Lubricant (water based jelly or xylocaine jelly)

Collection bag and tubing

Procedure

Insertion of a urinary catheter

in a female

Insertion of a urinary catheter

in a male

Review the female anatomy

in more detail

Review the male anatomy

in more detail

Gather equipment.

Explain procedure to the patient

Assist patient into supine position with legs spread and feet together

Open catheterization kit and catheter

Prepare sterile field, apply sterile gloves

Check balloon for patency.

Generously coat the distal portion (2-5 cm) of the catheter with lubricant

Apply sterile drape

If female, separate labia using non-dominant hand. If male, hold the penis with the non-dominant hand. Maintain hand position until preparing to inflate balloon.

Using dominant hand to handle forceps, cleanse peri-urethral mucosa with cleansing solution. Cleanse anterior to posterior, inner to outer, one swipe per swab, discard swab away from sterile field.

Pick up catheter with gloved (and still sterile) dominant hand. Hold end of catheter loosely coiled in palm of dominant hand.

In the male, lift the penis to a position perpendicular to patient's body and apply light upward traction (with non-dominant hand)

Identify the urinary meatus and gently insert until 1 to 2 inches beyond where urine is noted

Inflate balloon, using correct amount of sterile liquid (usually 10 cc but check actual balloon size)

Gently pull catheter until inflation balloon is snug against bladder neck

Connect catheter to drainage system

Secure catheter to abdomen or thigh, without tension on tubing

Place drainage bag below level of bladder

Evaluate catheter function and amount, color, odor, and quality of urine

Remove gloves, dispose of equipment appropriately, wash hands

Document size of catheter inserted, amount of water in balloon, patient's response to procedure, and assessment of urine

Complications

The main complications are tissue trauma and infection. After 48 hours of catheterization, most catheters are colonized with bacteria, thus leading to possible bacteruria and its complications. Catheters can also cause renal inflammation, nephro-cysto-lithiasis, and pyelonephritis if left in for prolonged periods.

The most common short term complications are inability to insert catheter, and causation of tissue trauma during the insertion.

The alternatives to urethral catheterization include suprapubic catheterization and external condom catheters for longer durations.

from

http://www.med.uottawa.ca/procedures/ucath/


Sharp Healthcare San Diego, CA 5 years ago

Urinary catheters

A urinary catheter is any tube system placed in the body to drain and collect urine from the bladder.

Information

Urinary catheters are used to drain the bladder. Your health care provider may recommend a catheter for short-term or long-term use because you have or had:

Urinary incontinence (leakage of urine or the inability to control when you urinate)

Urinary retention (being unable to empty the bladder when you need to)

Surgery that made a catheter necessary, such as prostate or gynecological surgery

Other medical conditions such as multiple sclerosis, spinal cord injury, or dementia

Catheters come in many sizes, materials (latex, silicone, Teflon), and types (Foley, straight, coude tip). A Foley catheter, for example, is a soft, plastic or rubber tube that is inserted into the bladder to drain the urine.

In general, the smallest possible catheter will be used. Some people may need larger catheters to control urine leakage around the catheter or if the urine is thick and bloody or contains large amounts of sediment.

There are three main types of catheters:

Indwelling catheter

Condom catheter

Intermittent (short-term) catheter

INDWELLING URETHRAL CATHETERS

An indwelling urinary catheter is one that is left in place in the bladder. Indwelling catheters may be needed for only a short time, or for a long time. These catheters attach to a drainage bag to collect urine. A newer type of catheter has a valve that can be opened to allow urine to flow out, when needed. An indwelling catheter may be inserted into the bladder in two ways:

Most often, the catheter is inserted through the urethra, which is the tube that brings urine from the bladder to the outside of the body

Sometimes, the doctor will insert a tube, called a suprapubic catheter, into your bladder from a small hole in your belly. This is done as an outpatient surgery or office procedure.

An indwelling catheter has a small balloon inflated on the end of it. This prevents the catheter from sliding out of the body. When it's necessary to remove the catheter, the balloon is deflated.

CONDOM CATHETERS

Condom catheters are most frequently used in elderly men with dementia. There is no tube placed inside the penis. Instead, a condom-like device is placed over the penis. A tube leads from this device to a drainage bag. The condom catheter must be changed every day.

INTERMITTENT (SHORT-TERM) CATHETERS

Some people only need to use a catheter on occasion. Short-term, or intermittent, catheters are removed after the flow of urine has stopped. For more information on this type of catheter, see: Clean intermittent self-catheterization.

DRAINAGE BAGS

A catheter is usually attached to a drainage bag. There are two types:

A leg bag is a smaller drainage device that attaches by elastic bands to the leg. It is usually worn during the day, because it fits discreetly under pants or skirts. It is easily emptied into the toilet.

A down drain is a larger drainage device. It may be used during the night. This device is hung on the bed or placed on the floor.

The drainage bag must always stay lower than the bladder to prevent urine from flowing back up into the bladder. Empty the drainage device at least every 8 hours, or when it is full.

Some experts recommend cleaning the drainage bag periodically. Remove the drainage bag from the catheter (attach the catheter to a second drainage device during the cleaning).

Cleanse and deodorize the drainage bag by filling the bag with two parts vinegar and three parts water. You can substitute chlorine bleach for the vinegar and water mixture. Let this solution soak for 20 minutes. Hang the bag with the outlet valve open to drain and dry the bag.

HOW TO CARE FOR A CATHETER

To care for an indwelling catheter, cleanse the urethral area (where the catheter exits the body) and the catheter itself with soap and water every day. Also thoroughly cleanse the area after all bowel movements to prevent infection.

If you have a suprapubic catheter, the opening in your belly and the tube must be cleansed daily with soap and water, then covered with dry gauze.

Drinking plenty of fluids can help prevent infections. Discuss this issue with your health care provider.

Wash your hands before and after handling the drainage device. Do not allow the outlet valve to touch anything. If the outlet becomes obviously dirty, clean it with soap and water.

Some people have occasional leakage of urine around the catheter. This may be caused by:

A catheter that is too small

Bladder spasms

Constipation

Improper balloon size

Urinary tract infections

If bladder spasms occur or there is no urine in the drainage bag, the catheter may be blocked by blood or thick sediment. Or, there may be a kink in the catheter or drainage tubing. Sometimes spasms are caused by the catheter irritating the bladder. Such spasms can be controlled with medication, although most patients eventually adjust to the irritation and the spasms go away. If you have been shown how to irrigate (or flush) the catheter, doing so may help reduce spasms. If you have not been instructed on irrigation, and urine is not flowing into your collection device, contact your health care provider immediately.

POTENTIAL COMPLICATIONS

Complications of catheter use include:

Allergy or sensitivity to latex

Bladder stones

Blood infections (septicemia)

Blood in the urine (hematuria)

Kidney damage (usually only with long-term, indwelling catheter use)

Urethral injury

Urinary tract or kidney infections

from

http://www.nlm.nih.gov/medlineplus/ency/article/00...


National Center of Neurology and Psychiatry 5 years ago

Urinary catheterization is the insertion of a catheter into a patient's bladder. The catheter is used as a conduit to drain urine from the bladder into anattached bag or container.

Urinary catheterization is employed in hospital and nursing home settings tomaintain urine output in patients who are undergoing surgery, or who are confined to the bed and physically unable to use a bedpan. Critically ill patients who require strict monitoring of urinary output are also frequently catheterized.

Intermittent insertion of a urinary catheter is a treatment option for patients with certain types of urinary incontinence. Patients who are unable to completely empty the bladder during urination (urinary retention), or patients who have a bladder obstruction, may also require intermittent urinary catheterization. Disabled individuals with neurological disorders that cause paralysis or a loss of sensation in the perineal area may also use regular intermittent catheter insertion to void their bladders.

Because urinary catheterization carries a risk of causing urinary tract infection (UTI), precautions should be used to keep the catheter clean and free ofbacteria. Patients requiring intermittent catheterization should be well trained in the technique by a qualified health care professional.

Intermittent catheterization is performed a minimum of four times a day by the patient or a care giver. The genital area near the urethral opening is wiped with an antiseptic agent, such as iodine. A lubricant may be used to facilitate the entry of the catheter into the urethra, and a topical local anesthetic may be applied to numb the urethral opening during the procedure. One endof the catheter is placed in a container, and the other end is inserted intoand guided up the urethra until urine flow begins. When urine flow stops, thecatheter may be moved or rotated, or the patient may change positions to ensure that all urine has emptied from the bladder. The catheter is then withdrawn, cleaned, and sterilized for the next use. Recommended cleaning practicesvary, from the use of soap and water to submersion in boiling water or a disinfectant solution. Some patients prefer to use a new catheter with each insertion.

Nonintermittent catheterization, which is initiated in a hospital or nursinghome setting, uses the same basic technique for insertion of the urinary tract catheter. The catheter is inserted by a nurse or other health care professional, and remains in the patient until bladder function can be maintained independently. When the catheter is removed, patients will experience a pullingsensation and may feel some minor discomfort. If the catheter is required foran extended period of time, a long-term, indwelling catheter, such as a Foley catheter, is used. To prevent infection, it should be regularly exchanged for a new catheter every three to six weeks.

Use of indwelling catheters should be restricted to patients whose incontinence is caused by urinary tract obstruction that can not be treated, and for which alternative therapy is not feasible.

If a patient wishes to perform intermittent catheterization himself, trainingin the technique by a qualified health care professional is required. Basicinstruction in the anatomy, antiseptic techniques, catheter insertion, and proper catheter care should be provided. Patients learning chronic intermittenturinary catheterization may also benefit from an ultrasound examination to verify that they are completely emptying their bladder during the procedure.

Patients using intermittent catheterization as a treatment for incontinence will experience a period of adjustment as they try to establish a catheterization schedule that is adequate for their normal level of fluid intake.

Antibiotics may be prescribed as a preventative measure in long-term urinarycatheterization patients who are at risk for urinary tract infection.

A patient with an indwelling catheter must be reassessed periodically to determine whether alternative treatment may be more effective in treating the problem.

Trauma to the urethra and/or bladder may result from incorrect insertion of the catheter. Repeated irritation to the urethra during catheter insertion maycause scarring and/or stricture, or narrowing, of the urethra. The cathetermay introduce bacteria into the urethra and bladder, resulting in urinary tract infection. UTI can cause fever and inflammation of the bladder and urethra. Patients who practice intermittent catheterization can reduce their risks for UTI by using antiseptic techniques for insertion and catheter care.

When used correctly, catheterization facilitates complete voiding of the bladder.

Read more: Urinary catheterization, Information about Urinary catheterization http://www.faqs.org/health/topics/31/Urinary-cathe...


Univerzitetni Klinicni Center Ljubljana 5 years ago

Urethral catheterization is a procedure that involves introducing a flexible rubber (latex, silicone, or Teflon) tube through the urinary opening (urethra) into the bladder.

There are two types of urethral catheterization. In straight, or short-term, urethral catheterization, a catheter is inserted only long enough to drain the bladder of urine and is then removed. In indwelling catheterization, a specialized catheter is inserted into the bladder for an extended period (days to weeks) to allow continuous drainage of urine into a collection bag.

A straight catheterization may be performed to obtain a sample of urine for laboratory analysis in individuals in whom a urinary tract infection, urinary tract injury, or kidney dysfunction is suspected. Indwelling urinary catheterization is usually performed to monitor the urine output of individuals undergoing surgery or after trauma or obstruction (obstructive uropathy) of the urinary tract or to drain the bladder in individuals finding it difficult to void (frequently during serious illnesses). Urinary catheterization may be performed in individuals who have urinary incontinence or who cannot empty their bladder because of neurological damage.

Older adults may need catheterization if they are at high-risk for urinary tract infection (cystitis) due to incomplete emptying of the bladder associated with prostate enlargement (in men), a decreased level of consciousness, or immobility. Other risk factors for cystitis include bladder or urethral obstruction, sexual intercourse, insertion of instruments into the urinary tract (catheterization or cystoscopy), pregnancy, diabetes, or a history of urinary reflux (reflux nephropathy).

Kidney infection (pyelonephritis) most often occurs as a result of lower urinary tract infection (cystitis), particularly in those who have backflow of urine from the bladder into the ureter or kidney (urinary reflux). The risk of pyelonephritis is increased in those with a history of cystitis, kidney stones, urinary reflux, or urinary tract obstruction. Individuals who have chronic or recurrent urinary tract infections are also at increased risk and may in some cases benefit from indwelling catheterization. Crushing injuries to the pelvis, gunshot wounds, or stab wounds may result in urinary tract trauma and require catheterization.

Obstructive uropathy is a blockage of the normal flow of urine somewhere along the urinary tract. The obstruction increases the pressure on the kidney and can result in acute renal failure. Obstructive uropathy may be caused by kidney stones, narrowing of the urethra, adjacent tumors, scarring of the urethra from radiation therapy, urinary tract infections, and cancer. It is most common in individuals with neuromuscular disorders, diabetes mellitus, benign prostatic hypertrophy, or a history of kidney stones.

Urinary incontinence may occur in individuals with weakened pelvic muscles or malfunction of the bladder neck (vesicourethral junction) and urinary sphincter. Trauma to the urethral area, neurological injury, and some medications also may weaken the urinary sphincter muscle that normally prevents leakage of urine from the bladder.

from

http://www.mdguidelines.com/urethral-catheterizati...


HealthPartners 5 years ago

Urinary catheters are slender, flexible tubes used to drain urine from the bladder to the outside of the body. Catheters are often used to prevent skin damage from wet clothing and bedding in patients who are incontinent--unable to control the flow of their urine. Patients who are unable to urinate because of injury, surgery or a medical condition may also be catheterized to facilitate the flow of urine. Catheterization can cause side effects such as infection and injury, according to the National Institutes of Health, or NIH.

Infection

Long-term use of catheters can cause urinary tract infections, according to the American Urological Association Foundation, or AUAF. The catheter can become contaminated with fecal matter after a bowel movement or can be contaminated during insertion. Symptoms include pain, cloudy urine and fever. If the patient will need the catheter for more than two years, inserting it through an abdominal incision directly into the bladder may prevent contamination. Untreated urinary tract infections can lead to kidney damage or to serious, life-threatening blood infections or septicemia. Patients can prevent infections by drinking plenty of fluids, cleaning around the catheter every day and using good hygiene practices after bowel movements. Patients who self-catheterize should be meticulous about cleaning their equipment and catheters to avoid contamination.

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Urinary Tract Injury

Long-term use of a catheter can cause injury to the urethra or the bladder, according to the AUAF. The urethra, the tube that leads from the bladder to outside of the body, can become torn and swollen and the scrotum may also swell. Symptoms include blood in the urine and pain. Some injuries can be prevented by using the smallest catheter possible and taping the tubing to the leg to avoid tension on it, according to the National Institutes of Health.

Blockage

Blood, sediment or a kink in the tubing can obstruct the flow of urine from the bladder to the collection bag. A severe blockage may cause urine to back up into the kidneys, causing renal damage. Drinking plenty of water, observing the flow into the bag periodically and irrigating the tubing can keep the urine flowing freely.

Bladder Spasms

Irritation of the bladder can cause it to spasm, according to the NIH. Bladder spasms can be painful and can impede the flow of urine. In some cases, the spams cause urine to leak around the catheter. The condition can be treated with medication, although some patients become used to the irritation and do not require treatment.

Allergic Reaction

Patients allergic to latex may have a sensitivity reaction that can range from mild itching to a life-threatening anaphylactic reaction if a caregiver mistakenly inserts a catheter made of latex into the bladder, according to the AUAF. Before performing a catheterization, the caregiver should ask about latex allergies and ensure that she uses a silicone- or Teflon-coated catheter if necessary. A hospitalized patient with a latex allergy should also be wearing a band or other type of identification that documents the allergy.

Read more: http://www.livestrong.com/article/192254-the-side-...


Vanderbilt Ingram Cancer Center 5 years ago

Background Dense perineal block from epidural analgesia increases the risk of urinary catheterization in labour. Mobile epidurals using low-dose local anaesthetic in combination with opioid preserve maternal mobility and may reduce the risk of bladder dysfunction. We conducted a three-arm randomized controlled trial to compare high-dose epidural pain relief with two mobile epidural techniques.

Methods A total of 1054 primparous women were randomized to receive high-dose bupivacaine, epidural analgesia (Control), combined spinal epidural (CSE), or low-dose infusion (LDI). The requirement for urinary catheterization during labour and postpartum was recorded. Both end points were pre-specified secondary trial outcomes. Women were evaluated by postnatal interview, when their bladder function had returned to normal.

Results Relative to Control, more women who received mobile epidural techniques maintained the ability to void urine spontaneously at any time (Control 11%, CSE 31% and LDI 32%) and throughout labour (Control 3.7%, CSE 13% and LDI 14%), for both mobile techniques P


Texas Children's Hospital 5 years ago

What is urinary catheterization?

Urinary catheterization is the insertion of a thin, hollow tube through your urethra and into your bladder. The bladder stores your urine and the urethra is the opening where urine comes out.

When is it used?

Urinary catheterization has many uses, including:

getting a sample of urine for lab tests, for example, to test for infection

emptying the bladder when you are not able to urinate normally

checking how well your kidneys are working during surgery or while you are hospitalized

checking your water balance (called intake and output) during illness

keeping the bladder empty during surgery.

How do I prepare for urinary catheterization?

You do not need to do anything to prepare for this procedure.

What happens during the procedure?

Catheters are usually inserted into the urethra while you are lying on your back. Your genital area will be cleaned with antibacterial soap, with special attention to the area where the urine comes out. In women this is just above the vagina. In men it is normally at the tip of the penis. In men who are uncircumcised, the foreskin will need to be pulled back to cleanse the head of the penis.

A sterile towel will be put on your thighs and abdomen to help make sure that the catheter stays sterile (bacteria-free). Your health care provider will use sterile gloves to hold the catheter. Lubricating jelly will be put on the tip of the catheter and it will be placed gently into the urethra. In women it goes in for just an inch or two. For men it goes into the full length of the penis.

A bag will be attached to the catheter to collect urine. If the catheter is placed to get a urine sample, once the urine has been collected, the catheter will be removed. If the catheter needs to stay in place for continued emptying or checking of your kidneys or water balance, then a tiny balloon (which you will not feel) will be inflated inside the bladder to hold the catheter in place. The tubing attached to the collecting bag will be taped to your leg.

What happens after the procedure?

After the procedure the area will be rinsed off. If the catheter did not have to stay in, you may feel some burning the next few times you urinate. The burning is from irritation of the urethra by the catheter. If the catheter is left in, you may have an irritating feeling that you need to urinate, even though your urine is passing into the collecting bag continuously as your kidneys produce it.

While you have the catheter, it is important to keep the bag below your pelvic area to keep the urine in the bag and tube from draining backwards into the bladder and prevent infection. For example, you may have a bag that can be strapped to your leg and fits under slacks or dresses so that it does not show.

If you are going home with a catheter, make sure that you have written instructions on how to care for the catheter. Ask your provider about anything you do not understand.

What are the benefits of this procedure?

Urinary catheterization has many possible benefits. For example, it may:

Give relief by emptying a full, painful bladder.

Show how well the kidneys are working.

Help diagnose urinary problems such as infection.

What are the risks of this procedure?

You will have some discomfort when the catheter is removed. Generally, the longer you have had the catheter, the longer the discomfort lasts. It may take several days for all stinging feelings during urination to stop.

The catheter may cause a bladder infection. This usually happens when the catheter has been in place for several days or weeks.

It can be painful and some tissue may be mildly damaged if you accidentally remove the catheter without deflating the balloon that keeps it in place.

When should I call my health care provider?

Call your provider right away if

The urine in the tube is bloody or cloudy, or it smells bad.

The catheter is causing constant pain, either in your urethra or in the area of your bladder.

You have a temperature of 101 degrees F (38.3 degrees C) or higher and there is no obvious reason for the fever.

There is little or no urine draining into the catheter and bag.

Call during office hours if:

You have questions about catheter care or how long the catheter needs to stay in.

You have questions about test results.

You need to make a follow-up appointment.

from

http://www.baptistonline.org/health/health_library...


Greenwich Hospital Connecticut 5 years ago

Urinary tract infections (UTI) associated with urinary catheters are the leading cause of secondary nosocomial bacteremia. Approximately 20 percent of hospital-acquired bacteremias arise from the urinary tract, and the mortality associated with this condition is about 10 percent [1].

Issues related to symptomatic and asymptomatic bacteriuria (both of which are subsets of UTI and are sometimes referred to as symptomatic or asymptomatic UTI) in patients with indwelling bladder catheters will be reviewed here.

Issues related to asymptomatic bacteriuria and cystitis in other circumstances, and the indications for placement, methods of catheterization, and management and complications of bladder catheters are discussed separately (see "Approach to the adult with asymptomatic bacteriuria" and "Acute cystitis in women" and "Acute cystitis and asymptomatic bacteriuria in men" and "Placement and management of urinary bladder catheters" and "Complications of urinary bladder catheters and preventive strategies").

DEFINITIONS

Asymptomatic bacteriuria (with or without an indwelling catheter) is characterized by a urine culture with >10(5) colony forming units (cfu)/mL of uropathogenic bacteria in the absence of fever >38ºC, suprapubic tenderness or costovertebral angle pain or tenderness [2]. While the CDC has established a definition of >10(5) colony forming units (cfu)/mL, the IDSA has defined asymptomatic bacteriuria as a single catheterized specimen with isolation of a single organism in quantitative counts of ?10(2) cfu/mL [3]. The more sensitive definition reflects the lower threshold for diagnosis when urine is being sampled by direct bladder puncture or fresh diagnostic catheterization with careful pre-procedure site preparation; it is not so useful in the setting of indwelling catheters.

Symptomatic catheter-related bacteriuria (usually referred to as UTI since a clinically significant infection is inferred) is defined as the presence of fever >38ºC, suprapubic tenderness, costovertebral angle tenderness, or otherwise unexplained systemic symptoms such as altered mental status, hypotension, or evidence of a systemic inlammatory response syndrome, together with one of the following laboratory profiles

from

http://www.uptodate.com/patients/content/topic.do?...


Univesity of California San Diego Medical Center Moores Cancer Center / Ucsd Cancer Center 5 years ago

URINARY CATHETER COATING AGENT

Biofilm problem:

Catheter associated urinary tract infections caused by the formation of biofilms on urinary catheter surfaces. Bacteria imbedded in the biofilm are very difficult to control with currently available technoogy.

Market size:

US $7 billion worldwide urinary catheter market. Infections caused by urinary catheters account for 40% of all hospital acquired infections and cost the healthcare system over US $1 billion per year in the United States alone.

Kane Biotech solution:

Aledex™(formerly called PS/CHX), a novel combination of FDA approved agents for coating urinary catheters for bacterial control and biofilm prevention and dispersal.

Technology status:

Aledex™, Kane Biotech’s lead urinary catheter coating product has shown its efficacy and broad spectrum activity in preventing catheter related infections in vitro and in vivo.

Pre-clinical results: Catheter related infections with Aledex™ coated catheters

Catheters coated with Aledex™were significantly less likely to cause catheter related infection* in animal studies.

According to the US Centre for Disease Control (CDC), the urinary tract is the most common site of infections acquired in a hospital, or hospital-like setting, accounting for more than 40% of the total number reported by acute-care hospitals and affecting an estimated 600,000 patients a per year. Most of these infections - 66% to 88% - are as a result of urinary catheterization.

There is an urgent need to control and reduce the number of infections acquired by patients after their admission to the hospital. These hospital acquired (nosocomial) infections, many of which are caused by in-dwelling medical devices, pose a threat to any patient admitted to a hospital and contribute considerably to the costs and morbidity associated with hospitalization.

In-dwelling medical devices are responsible for the vast majority of nosocomial infections. The most common cause of device-related infection is the urinary catheter. Urinary catheterization is involved in up to 90% of all nosocomial urinary tract infections (UTI), as the catheter surface serves as a platform for the growth of bacteria as biofilm. As the duration of catheterization increases, catheter associated UTI rates approach 100%. Patients who acquire a UTI will stay longer in hospital an average of six days longer than those who do not, and will contribute to an extra $1.8B in hospital costs.

Recent studies have shown an abundance of evidence that anti-microbial catheters provided benefits when compared to standard uncoated catheters. Furthermore, there is a vast support for the assertion that the increased cost of an effective coated catheter is justified with even a modest reduction in the rate of UTI. Due to these facts, and the Centre for Disease Control and Prevention’s recommendations for the use of anti-microbial coated catheters, there is a growing market demand for these types of products. The current $175 million US anti-microbial coating market is forecast to grow to over $500 million by 2012.

Kane Biotech is building a pipeline of non-antibiotic catheter coatings for the prevention of catheter-associated infections. The Company’s lead coating for urinary catheters is Aledex™. In a recent study, Aledex™ was compared to silver hydrogel coated and uncoated commercially available catheters in a recognized in vivo model. Study results demonstrated that the Aledex™ coated urinary catheters were significantly less likely to be colonized b bacteria than either the silver-hydrogel coated or uncoated catheters. Furthermore, the study showed that Aledex™ coated urinary catheters were significantly less likely to cause catheter related infections than either the silver-hydrogel coated or uncoated catheters. All the results comparing Aledex™ to other test groups were statistically significant.

There are a limited number of coated urinary catheters in the market today, predominantly made up of those coated with silver. Although the anti-microbial activity of silver is documented, the use of silver on medical devices is continually debated based on lack of conclusive evidence supporting its ability to reduce infection. The results of the Kane Biotech study were consistent with the concerns cited regarding the efficacy of silver. Of even greater concern, multi-drug resistant bacterial strains continue to increase their prevalence in the hospital environment. According to leading experts, catheter associated UTI are perhaps the prime reservoir for antibiotic resistant pathogens. There is an opportunity for Kane Biotech’s non-antibiotic coating, Aledex™, to positively impact the antibiotic resistance problem by reducing the need for systematic antibiotics, while preventing the ability for dangerous resistant pathogens to take hold through the formation of biofilm on the catheter surface.

from

http://www.kanebiotech.com/urinary_catheter.htm


Ontario Community Care Access Centres 5 years ago

The study was conducted at St John Hospital and Medical Center, a 769-bed tertiary care teaching hospital in Detroit, Mich. The authors examined 532 instances in which urinary catheters were placed in emergency room patients over a 12-week study period. After reviewing whether the catheter's placement conformed to established guidelines, the authors determined that half of the female patients 80 years or older who were subjected to urinary tract catheterization did not meet institutional guidelines. Women were 1.9 times more likely than men, and the very elderly (greater than 80 years) were 2.9 times more likely than those 50 years and younger, to have a urinary catheter inappropriately placed.

"We found that it was twice as likely for women to have a non-indicated UC [urinary catheter] placement compared to men," the authors conclude. "Our results confirm what has been reported in previous studies, and underscore the significant risk of the very elderly (80 years or older) for inappropriate UC utilization."

The study's findings point to an area of concern among healthcare professionals tackling preventable hospital infections. Urinary tract catheterization is a major risk factor for developing urinary tract infections. The researchers note that at present, urinary tract infections account for more than one-third of all hospital-acquired infections. If urinary catheters are inappropriately placed at high rate in very elderly women, this vulnerable group of patients is at increased risk for developing an infection, according to the investigators.

"The inappropriate UC [urinary catheter] utilization has been a ubiquitous problem in the hospital setting," say the study's authors. "This translates to additional preventable or avoidable urinary tract infections and other complications related to UCs."

The federal government's Centers for Medicare & Medicaid Services considers catheter-associated urinary tract infections to be reasonably preventable through application of evidence-based best practices and as such no longer reimburses for these hospital-acquired infections. The authors noted that the majority of U.S. hospitals do not have formal systems to monitor urinary catheter utilization.

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http://www.physorg.com/news/2010-11-elderly-women-...


http://www.hamiltonhealthsciences.ca/ 5 years ago

INTRODUCTIONSometimes the homeostasis of the urinary system becomes upset, making thenormal function of micturition impossible. There may be a need then for catheterization.Health care providers must strive to make this a safe, efficient, and non-traumaticexperience for the patient.4-2.PURPOSES OF CATHETERIZATIONThere are a number of reasons why catheterization may be performed. Includedare the following:a. Obtain a sterile urine specimen.b. Measure the amount of residual urine in the bladder.c. Relieve a distended bladder in the patient who is unable to void.d. Provide continuous drainage or irrigation.e. Administer medications such as a chemotherapeutic solution.f. Measure the urinary output.g. Prepare a patient for a surgical procedure or obstetrical delivery (childbirth).h. Assist the patient following surgery.4-3.INDICATIONS FOR CATHETERIZATIONIndications for catheterization include the following:a. The patient's bladder is severely distended.b. Urinary output is severely decreased.c. There is a significant outflow obstruction.d. The patient is in shock or pre-shock status.e. The patient has an acute spinal cord injury

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http://www.tpub.com/content/armymedical/MD0579/MD0...


Hamilton Health Sciences 5 years ago

Department of Microbiology and Immunology, School of Medicine, University of Maryland—Baltimore, 655 W. Baltimore Street, Baltimore, Maryland 21201,1 Cardiff School of Biosciences, Cardiff University, Cardiff, Wales CF10 3TL, United Kingdom,2 Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan 48109,3 Department of Biomedical Sciences, Dental School, University of Maryland—Baltimore, 650 W. Baltimore Street, Baltimore, Maryland 212014

SUMMARY

INTRODUCTION

PATHOGENESIS OF CAUTIs

CAUTIs DUE TO E. COLI

Adhesins

Motility

Invasion and Biofilm Formation

Avoidance of Host Immune Response

Damage to the Host and Acquisition of Nutrients

CAUTIs DUE TO PROTEUS MIRABILIS

Adhesins

Motility

Biofilm Formation

Avoidance of Host Immune Response

Damage to the Host and Acquisition of Nutrients

PREVENTION OF CAUTIs

Limiting Catheter Usage

Condom and Suprapubic Catheters and Intermittent Catheterization

Closed-System Foley Catheters and Proper Use by Health Care Professionals

Prevention of Bacterial Colonization of the Urinary Meatus and Urinary Tract

Novel Surfaces

Catheters Containing Antimicrobial Agents

Probiotics

Future Promising Technologies

DIAGNOSIS AND TREATMENT OF CAUTIs

PROGNOSIS OF CAUTIs

REFERENCES

SUMMARY

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Catheter-associated urinary tract infections (CAUTIs) represent the most common type of nosocomial infection and are a major health concern due to the complications and frequent recurrence. These infections are often caused by Escherichia coli and Proteus mirabilis. Gram-negative bacterial species that cause CAUTIs express a number of virulence factors associated with adhesion, motility, biofilm formation, immunoavoidance, and nutrient acquisition as well as factors that cause damage to the host. These infections can be reduced by limiting catheter usage and ensuring that health care professionals correctly use closed-system Foley catheters. A number of novel approaches such as condom and suprapubic catheters, intermittent catheterization, new surfaces, catheters with antimicrobial agents, and probiotics have thus far met with limited success. While the diagnosis of symptomatic versus asymptomatic CAUTIs may be a contentious issue, it is generally agreed that once a catheterized patient is believed to have a symptomatic urinary tract infection, the catheter is removed if possible due to the high rate of relapse. Research focusing on the pathogenesis of CAUTIs will lead to a better understanding of the disease process and will subsequently lead to the development of new diagnosis, prevention, and treatment options.

INTRODUCTION

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References

Indwelling urinary catheters are standard medical devices utilized in both hospital and nursing home settings to relieve urinary retention and urinary incontinence. Of the almost 100 million catheters that are sold annually worldwide, one-quarter of them are sold in the United States (50). The most common urinary catheter in use is the Foley indwelling urethral catheter, a closed sterile system that is comprised of a tube inserted through the urethra and held in place by an inflatable balloon to allow urinary drainage of the bladder. Although these devices were originally designed for short-term use in patients, indwelling catheter use is now commonplace in the long-term setting.

Due to the frequent and sometimes unnecessary use of indwelling catheters during hospitalization (21 to 50% of patients) (153), many patients are placed at risk for complications associated with the use of these devices. A study of 1,540 nursing home residents determined that the risk of hospitalization, length of hospitalization, and length of antibiotic therapy were three times higher in catheterized residents than in noncatheterized residents (205). The most notable complication associated with indwelling urinary catheters is the development of nosocomial urinary tract infections (UTIs), known as catheter-associated UTIs (CAUTIs). Infections of the urinary tract associated with catheter use are significant not only due their high incidence and subsequent economic cost but also because of the severe sequelae that can result.

CAUTIs, the most common type of nosocomial infection, account for over 1 million cases annually (401) or over 40% of all nosocomial infections in hospitals and nursing homes (382, 383, 438) and constitute 80% of all nosocomial UTIs (132). Due to this high incidence, the overall cost for medical intervention of nosocomial UTIs is staggering, with an estimated $424 million to $451 million spent annually in the United States to manage these infections (157). Furthermore, catheter-associated bacteremia is estimated to cost approximately $2,900 per episode (339). Costs for treatment of nosocomial UTIs include antimicrobial therapy, increases in length of stay during hospitalization, physician visits, and morbidity (98). These costs will inevitably rise due to advances in preventive medicine that extend life expectancy, increasing the elderly population. This population today (those 65 years old) accounts for approximately 12.6% (37,849,672) of the total population of the United States (301,139,947) (422); their care accounts for about one-third (6) of the estimated $1 trillion in U.S. health expenditures (279).

Individuals requiring an indwelling catheter are predisposed to the development of CAUTIs due to the presence of an indwelling catheter device and potentially pathogenic multidrug-resistant organisms in the hospital setting. Despite the imminent threat of infection from these potent opportunistic nosocomial multiresistant strains, most cases of catheter-associated bacteriuria or the presence of bacteria in the urine are asymptomatic.

However, when an episode of CAUTI becomes symptomatic, the resulting sequelae can range from mild (fever, urethritis, and cystitis) to severe (acute pyelonephritis, renal scarring, calculus formation, and bacteremia). Left untreated, these infections can lead to urosepsis and death (284, 438). These complicated infections commonly recur and result in long-term morbidity due to the presence of encrustation and blockage of the catheter by crystalline biofilms that increase resistance to the host immune response and to antibiotics (394). Since the incidence of symptomatic CAUTIs is a major health concern due to the complications and recurrence associated with this type of infection, research directed at understanding the pathogenesis of CAUTIs is warranted and should lead to new and improved diagnosis, prevention, and treatment options.

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http://cmr.asm.org/cgi/content/full/21/1/26


Universitätsklinikum Carl Gustav Carus Dresden 5 years ago

Despite innate mechanical safeguards against microbial infection of the intact human urinary tract, specific organisms are capable of colonizing and persisting in this environmental niche. Similar to other mucosal pathogens, uropathogens employ specific strategies to infect the urinary tract, including colonization of a urinary catheter and/or mucosal site (uroepithelial cells), evasion of host defenses, replication, and damage to host cells. The insertion of a foreign body such as an indwelling catheter into the bladder increases the susceptibility of a patient to UTIs, as these devices serve as the initiation site of infection by introducing opportunistic organisms into the urinary tract. The majority of these uropathogens are fecal contaminants or skin residents from the patient's own native or transitory microflora that colonize the periurethral area (56, 66, 217, 288, 462). Transitory microflora that originate from hospital personnel or from contact with other patients may represent antibiotic-resistant nosocomial strains, complicating treatment for these infections. Bacterial entry into the bladder can occur at the time of catheter insertion, through the catheter lumen, or along the catheter-urethral interface (439). The preferred mechanism of bladder entry during CAUTIs is extraluminal (66%), where organisms ascend from the urethral meatus along the catheter urethral interface. Organisms can also enter the bladder intraluminally (34%), where the bacteria migrate into the bladder as a result of manipulation of the catheter system (400, 440).

Indwelling urinary catheters further favor the colonization of uropathogens by providing a surface for the attachment of host cell binding receptors that are recognized by bacterial adhesins, thus enhancing microbial adhesion. Upon insertion, urinary catheters may damage the protective uroepithelial mucosa, which leads to the exposure of new binding sites for bacterial adhesins (108). Lastly, the presence of the indwelling catheter in the urinary tract disrupts normal host mechanical defenses, resulting in an overdistension of the bladder and incomplete voiding that leaves residual urine for microbial growth (133).

Organisms capable of infecting the urinary tract during catheterization use approaches to establish infection that are similar to those used by organisms that cause uncomplicated UTIs. However, due to the introduction of a foreign body, organisms causing CAUTIs require fewer recognized virulence factors to colonize and establish infection than those required by pathogens to infect a fully functional urinary tract.

Bacterial adhesins initiate attachment by recognizing host cell receptors located on surfaces of the host cell or catheter. Adhesins initiate adherence by overcoming the electrostatic repulsion observed between bacterial cell membranes and surfaces to allow intimate interactions to occur (61). These factors are differentially expressed during the course of infection not only for the recognition of different surfaces and cell types that the uropathogen encounters (e.g., in bladder versus the kidney) but also to evade the host immune response. These bacterial cell surface structures recognize specific host cell surface and extracellular matrix components such as proteins, glycoproteins, glycolipids, and carbohydrates. Gram-negative uropathogens produce an assortment of adhesins including those attached to the tip of hair-like projections, known as fimbriae or pili, as well as adhesins anchored directly within bacterial cell membranes, known as nonfimbrial adhesins.

Once firmly attached on the catheter surface or the uroepithelium, bacteria begin to phenotypically change, producing exopolysaccharides that entrap and protect bacteria. These attached bacteria replicate and form microcolonies that eventually mature into biofilms (Fig. 1). During biofilm development, intracellular communication by quorum sensing regulates formation and detachment from biofilms through the collective expression of genes after cellular populations reach a threshold concentration. The rate of genetic material exchange occurring within the biofilm is greater than that between planktonic cells (134, 326), thereby allowing the potential spread of antibiotic resistance genes and other traits. Once established, biofilms inherently protect uropathogens from antibiotics and the host immune response (63). The shedding of daughter cells from actively growing cells and the shearing of biofilm aggregates from the mature biofilm seed other sections of the catheter and bladder.

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http://cmr.asm.org/cgi/content/full/21/1/26


Ehealthconnection Catholic Healthcare Partners 5 years ago

Many uropathogens use flagellum-mediated motility and type IV pilus-mediated (twitching) motility to facilitate the spread of infection from the initial colonization site to the urinary tract. Twitching motility via type IV pili cycles through periods of extension, attachment, and retraction in gram-negative bacteria (33, 256) and is thought to play a significant role in virulence (128).

Once colonized on the catheter and uroepithelium, uropathogens must adapt to the urinary tract environment and acquire nutrients. The production and secretion of degradative enzymes and toxins into the local environment may lead to a breakdown of tissue, releasing nutrients. As iron is a limiting nutrient in the human host (447), uropathogens have developed complex iron acquisition systems such as heme transporters, ferric and ferrous iron transport systems, and siderophore iron uptake systems to circumvent host iron-sequestering mechanisms. Certain uropathogens are capable of using urea, found in high concentrations in human urine (up to 500 mM) (35, 170), as a nitrogen source due to the expression of urease. As a consequence of urease-mediated hydrolysis of urea to ammonia and carbon dioxide, the local environment becomes alkalinized, which leads to the precipitation of polyvalent ions that become enmeshed in the biofilms on catheters and urinary epithelial surfaces (118). These crystalline biofilms must be removed from the host to completely resolve the infection, since antimicrobial agents may be ineffective at eliminating biofilm-associated bacterial populations.

To maintain an infection in the human urinary tract, pathogens must be capable of evading the host immune response. Gram-negative uropathogens enact a number of mechanisms of host immune evasion, including the production of capsules, immunoglobulin A (IgA) proteases, and lipopolysaccharides (LPSs). Capsules, comprised of repeating units of polysaccharides, play a role in evading the immune system by resisting phagocytosis, antimicrobial peptides, and the bactericidal effects of human serum (46, 311, 454). Capsular structures elicit a poor immunogenic response due to their structural similarities to polysialic acid residues found on human cells (415). Additionally, this barrier plays a role in late biofilm development (346) and protects against desiccation and phage attack. It also assists in accelerating the urinary stone crystallization process via electrostatic interactions that accumulate urinary ions at the bacterial surface (55, 87, 408). During the course of UTIs, antibodies that recognize antigenic components of uropathogens are produced. However, proteases targeting immunoglobins and other host defense components such as complement (C1q and C3) and antimicrobial peptides (human beta-defensin 1 [hBD1] and human cathelicidin LL-37) protect uropathogens from the host response (24). LPS, a requisite constituent of gram-negative bacterial outer membranes, is composed of three components: a lipid A molecule that anchors LPS to the membrane, a core consisting of polysaccharides, and a variable O antigen. This macromolecule elicits a potent inflammatory response that initiates the development of septic shock in systemic infections. Various components of LPS have been demonstrated to be important for resistance to antimicrobial peptides (95) and complement-mediated lysis. A summary of virulence factors expressed by gram-negative bacteria

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http://cmr.asm.org/cgi/content/full/21/1/26


Long Island Jewish Medical Center 5 years ago

During the course of researching literature for this review, it was surprising how little research has been directed specifically towards virulence associated with CAUTIs given the staggering number of patients that develop this type of infection annually. As a reflection of this finding, the majority of this review will discuss the virulence factors that are involved in the pathogenesis of UTIs caused by two gram-negative bacterial etiologic agents associated with CAUTIs, Escherichia coli and Proteus mirabilis, and how these factors may contribute to infections associated with indwelling catheters. When applicable, known virulence factors that are associated with the pathogenesis of CAUTIs will be described. Lastly, the review will conclude with methods used for the prevention and treatment of patients who develop these infections.

CAUTIs DUE TO E. COLI

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E. coli, undoubtedly the most researched microorganism, is a facultative anaerobe that is a member of the family Enterobacteriaceae. While both commensal and uropathogenic E. coli (UPEC) strains colonize the large intestines of humans, only UPEC strains are primarily selected for growth in the urinary tract. Virulence factors that differentiate these avirulent commensals from virulent strains of E. coli were acquired on mobile genetic elements by horizontal gene transfer; examples of such transfer can be found on the E. coli chromosome in the form of pathogenicity islands (125). These virulence factors enable E. coli strains to colonize and persist in the human host despite highly effective host defenses (278). E. coli strains have evolved to cause a variety of human diseases including sepsis, meningitis, diarrhea, and UTIs (276). These organisms are serotypically diverse, spanning over 250 serotypes based on O, H, and K antigens (292). Strains of E. coli associated with infections of the urinary tract are referred to as UPEC strains and are a subset of strains called extraintestinal pathogenic E. coli strains, which cause UTI, sepsis, and meningitis.

UPEC strains are the most commonly isolated organisms in community-acquired UTIs (70 to 90%) and among the most commonly isolated in nosocomially acquired UTIs (50%) including CAUTIs (202). E. coli has been identified as the causative agent in 90% of all case of UTI in ambulatory patients (167). UPEC strains can be classified into four phylogenetic groups, designated A, B1, B2, and D, with strains classified as B2 and D usually causing the most extraintestinal infections including UTIs (287). Since these organisms are capable of colonizing the intestinal and vaginal tracts as well, these sites can serve as potential reservoirs for UTIs and CAUTIs (83, 160).

As with other organisms, UPEC strains possess an arsenal of virulence factors that specifically contribute to their ability to cause disease in the human urinary tract. Genes encoding hemolysin, P fimbriae, S fimbriae, and cytotoxic necrotizing factor 1 (CNF1), for example, have been identified on various pathogenicity islands in different UPEC strains (125). This genetically heterogenous group of organisms varies in its capacity to colonize and persist in the urinary tract (99, 158). DNA microarray analysis of E. coli CFT073, a pyelonephritis strain, compared transcriptional profiles of this strain grown in LB, in human urine, and in the murine bladder cystitis model of infection (126, 376) and verified the in vivo expression of type 1 pili, iron acquisition proteins, and capsule (15, 335, 336, 345). In a prevalence study conducted by Kanamaru et al. (180), who compared 427 E. coli strains (377 UTI isolates and 50 fecal isolates) using PCR assays, the putative virulence factors iroN, iha, kpsMT, ompT, and usp were found 2.0 to 4.3 times more frequently in UTI isolates than in fecal isolates and were strongly associated with a specific anatomical site of infection (i.e., kidney or bladder).

Since UPEC strains are more commonly associated with infections of the intact urinary tract, it is thought that less-virulent organisms are capable of causing complicated UTIs such as CAUTIs. These bacteria may express less and perhaps different virulence factors during this process compared to organisms that are able to infect structurally and functionally normal urinary tracts (261). It has been implied that UPEC strains that infect the catheterized urinary tract have a reduction in the expression of P fimbriae and possibly other factors such as hemolysin, serum resistance, colicin production, and certain H, O, and K serotypes (261). An analysis of 70 clinical urinary strains of E. coli isolated from patients with spinal injuries undergoing long-term bladder catheterization identified that these strains rarely possess a complete arsenal of virulence factors possessed by strains isolated from cases of uncomplicated UTI (26). Among 70 urinary isolates, the prevalences of virulence factors were as follows: mannose-resistant hemagglutinins, 30%; P fimbriae, 17%; hemolysin, 27%; K antigens, 28%; and aerobactin, 33% by bioassay and 39% by gene probe (26). These findings indicate that the presence of a urinary catheter and a neuropathic bladder increases susceptibility to colonization of the urinary tract (26). Despite its prominent role in CAUTIs, limited research specifically addressing UPEC and its ability to cause these types of infections has been performed. Because of this, we will focus on the most recent developments in the research on UPEC and its role in UTIs and, when applicable, any research that is devoted to the field of bacterial virulence during CAUTIs.

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http://cmr.asm.org/cgi/content/full/21/1/26


Oxford Radcliffe Hospitals 5 years ago

Adhesins

UPEC strains and other uropathogens must attach to uroepithelial cells and the catheter surface to colonize and initiate CAUTI and may express a variety of adhesins to assist in this initial attachment. These adhesins also contribute to the direct triggering of host and bacterial signaling pathways, assisting in the delivery of bacterial products to host tissues, and promoting bacterial invasion into host cells (271). A study by Reid et al. (321) suggested that nonspecific adhesins, not specific fimbriae, expressed by UPEC are responsible for attachment to urinary catheter material. It is unknown which specific adhesin molecules are involved in the colonization of UPEC on catheter surfaces. However, potential adhesins associated with UTIs, including type 1, P, S, FC1, and F9 fimbriae and Iha and Dr adhesins, could possibly play a role during CAUTIs. The most extensively studied adherence factors of UPEC are type 1 and P fimbriae (271); an in-depth description of these structures has been reported previously (96, 271).

Type 1 fimbriae, the most frequently expressed virulence factor of UPEC (80 to 100% of strains), are composite helical cell surface structures consisting of repeating major pilin FimA subunits, tip fibrillum (FimF and FimG), and tip adhesin FimH assembled via the chaperone (FimC)-usher (FimD) pathway (344). These pili undergo phase variation and are regulated by the recombinases FimB and FimE.

In a study by Mobley et al. (261) examining urine cultures of 51 long-term catheterization patients over a year, type 1 fimbriae were expressed by a significantly higher number of UPEC isolates causing the most persistent infections than by strains causing transient infections. These pili are thought to be critical for the interaction of UPEC with uroepithelial cells during colonization of the bladder (59, 211, 272, 403). FimH of type 1 pili is thought to be involved in the adherence of these organisms to the bladder epithelium through the recognition and binding of the mannosylated integral membrane glycoproteins uroplakin Ia (467) and uroplakin Ib located on superficial epithelial cells. This tip adhesin also recognizes extracellular matrix proteins including collagen (types I and IV), fibronectin, and laminin as well as Tamm-Horsfall protein. Therefore, these bacterial adhesive structures are able to recognize epithelia (bladder and kidney), immune cells (macrophages, neutrophils, and mast cells), erythrocytes, and extracellular matrix proteins. This tip adhesin may also mediate bacterial autoaggregation and biofilm formation (313, 347, 348).

In addition, type 1 pili are believed to induce an inflammatory response associated with UPEC attachment and invasion (202) through the binding of FimH to specific mast cell receptors that initiate this response by the secretion of inflammatory mediators (1). Lastly, Snyder et al. (377) demonstrated that the expression of type 1 fimbriae coordinately affects the expression of P fimbriae in an inverse manner that may coordinate sequential events during colonization during UTIs in vitro and in vivo as examined by CFT073-specific DNA microarray analysis and mutagenesis studies using a mouse model. This adhesin has been associated with the invasion process as will be discussed later in the review. As these pili have been suggested to be expressed for the initial interactions between UPEC and various surfaces, it is speculated that type 1 pili could be involved in the initial interactions with the catheter surface or in interactions with uroepithelial cells during CAUTIs associated with UPEC.

P fimbriae or pyelonephritis-associated pili (pap) are the second most common virulence factors associated with UPEC uropathogenesis. The genetic determinants responsible for the production of these fimbriae are encoded on the UPEC chromosome by the papABCDEFGHIJK operon. P fimbriae are composed of heteropolymeric fibers consisting of different protein subunits (148), including proteins involved in the structure of the pilus (major pilin PapA, pilus anchor PapH, tip fibrillum PapKEF, and tip adhesin PapG), pilus assembly (periplasmic chaperone PapD and outer membrane usher PapC), and pilus regulation (PapB and PapI). Some studies have shown that P pili are needed by UPEC strains during UTIs; others have failed to show this requirement. UPEC strains expressing P fimbriae attach to globoside residues present on human kidney epithelial cells, which is suggested to play a role in the virulence associated with pyelonephritis (present in 80% of pyelonephritic E. coli strains) as well as ascending UTI (79, 310). Attachment to uroepithelial cell digalactoside receptors mediated by these fimbriae has been shown to induce cytokine secretion (interleukin-6 [IL-6] and IL-8) by this cell type in vitro (137). Studies have proposed that P pili may be important in establishing a bacterial reservoir in the intestinal mucosa (113, 233). However, experimental evidence suggests that these adhesins appear to have a less important role in colonizing abnormal or obstructed urinary tracts (156, 416). Based on these findings, it is thought that P pili may have either no role or a limited role during CAUTIs caused by UPEC.

UPEC is capable of expressing other surface adhesins including S pili (271), F1C pili, F9 fimbriae, IrgA adhesin, and Dr adhesins (271). S pili, consisting of the major subunit SfaA and the minor subunits SfaG, SfaH, and SfaS, recognize and bind sialyl galactosides on human kidney epithelial cells (191) and have been shown to play a role in UTIs caused by UPEC in rats (238). F1C pili, encoded by 14% of UPEC isolates, recognize and attach to kidney epithelial (distal tubules and collecting ducts) and endothelial (bladder and kidney) cells (183). Recently, Ulett et al. described a novel fimbria for UPEC strain CFT073 known as F9 fimbriae (420). These fimbriae were suggested to play a role during biofilm formation and are found in other UPEC and other pathogenic E. coli strains. The precise role of these surface structures during infection is currently unknown. UPEC expresses an iron-regulated gene homologue adhesin IrgA, designated Iha, during UTIs. This outer membrane protein is prevalent among clinical UPEC strains (38 to 74%) (16, 166) compared to fecal E. coli isolates (14 to 22%). Recombinant Iha from the pyelonephritogenic E. coli isolate CFT073 conferred adherence to cultured T-24 human uroepithelial cells to nonadherent E. coli strain ORN172 (163). In addition, a mutant in iha was more attenuated in a mouse model of ascending UTI than wild-type strain CFT073 and UPEC76 (CFT073 pap mutant) (163).

The Dr adhesin family of UPEC includes the uropathogen-associated fimbrial adhesin Dr and nonfimbrial adhesins (AFA-I, AFA-II, AFA-IV, Nfa-I, and Dr-II) (271) and has been associated with cystitis (30 to 50%) in children (114). The Dr operon consists of six genes encoding the main structural subunit DraA, the chaperone DraB (308), the usher DraC (308), the potential invasin DraD (106), DraP, and the adhesin DraE (465). The structural adhesin DraE determines the receptor-binding specificity of Dr adhesins (285). This adhesin is believed to be important in bacterial persistence in the urinary tract through the invasion of bladder and kidney epithelia via the interaction of these fimbriae with decay-accelerating factor (CD55) (286), a regulatory protein that protects tissues from autologous complement-mediated damage. The Dr adhesin also binds type IV collagen (286) and integrins, thus promoting recognition and the adherence of these organisms to interstitial compartments of the kidney, neutrophils, and erythrocytes. Strains of UPEC expressing Dr adhesin were capable of causing chronic experimental pyelonephritis in C3H/HeJ mice (114). They were also capable of long-term survival in human epithelial cells and persisting in the kidneys of experimental animals for months (215). It is unknown if this family of adhesins is expressed during CAUTIs caused by UPEC.

In summary, UPEC is known to express a number of adherence factors that assist in its ability to persist in the urinary tract. However, there is limit


Women's and Children's Hospital Adelaide 5 years ago

Motility

It is postulated that once UPEC is established on the catheter surface, flagellum-mediated motility is important for the ascent of this uropathogen from the catheter to the bladder and subsequently to the upper urinary tract (ureter and kidney). The synthesis of the flagellar structure is coordinated in a complex regulon consisting of several operons arranged in a hierarchical system (discussed in detail in a review by Fernández and Berenguer [96]). The filament of flagella consists of flagellin, the major filament subunit encoded by the fliC gene, that extends into the extracellular milieu from the outer membrane. The filament is connected to the flagellar hook FlgE through its attachment to the junction proteins FlgK and FlgL and the filament scaffolding protein FlgD (96). Two recent mutagenesis studies by Lane et al. (208) and Wright et al. (459) demonstrated that flagella, while not absolutely required for virulence during UTIs, greatly enhanced the persistence and fitness of UPEC during this type of infection. Therefore, flagellum-mediated motility should likely be considered to be important for the movement of UPEC on the catheter surface and from the catheter surface to the uroepithelium. This, however, has not been directly demonstrated.

Invasion and Biofilm Formation

Once initial attachment and permanent adherence commence on either the surface of catheters or uroepithelial cells, the establishment of UPEC infection occurs through the colonization of the bladder by the invasion of host cells and the subsequent formation of biofilms. As demonstrated in murine models, UPEC has developed mechanisms to invade host cells, and several reviews discussed this phenomenon in detail (32, 271). UPEC strains have been observed in vitro and in vivo to be internalized by bladder epithelial cells (103, 241, 251) and renal epithelial cells (82, 294, 380, 442). Several adhesins and toxins have been implicated to be involved in the process of invasion, including type 1 fimbriae, the Afa/Dr adhesin family (Dr, Dr-II, F1845, Afa-1, and Afa-3), S pili, P pili, and CNF1. Type 1 fimbria-mediated invasion is dependent upon FimH expression (241). E. coli strains that express Dr adhesins have been observed to invade epithelial cells including Caco-2 intestinal cells (115, 286). Dr adhesin-mediated invasion of uroepithelial cells is dependent upon the presence of the decay-accelerating factor receptor on host cells (117) and may contribute to persistence within the upper urinary tract (271). Research into the roles of S and P pili (241) during bacterial invasion of epithelial cells has not been studied in depth. However, it has been proposed that these pili, in conjunction with toxins, may facilitate the invasion of host tissues (115, 116).

CNF1, discussed later in the review, has been implicated in the invasion of UPEC into uroepithelial cells. This secreted toxin enters the host via the low-pH-mediated endocytotic pathway (54) and then constitutively activates key Rho GTPases that signal the reorganization of the actin cytoskeleton in the host cell. CNF1 has been shown to induce apoptosis in bladder epithelial cells via terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling. Thus, this toxin may play a role in bladder cell shedding in vivo and exposing the underlying tissue for bacterial invasion (257).

The ability of UPEC strains to persist in the urinary tract has been demonstrated by Justice et al. to reside within the superficial umbrella cells of C3H and BALB/c murine bladders due to the formation of biofilm structures known as intracellular bacterial communities (IBCs) (175). These IBCs are formed in a sequential manner. First, during murine cystitis, UPEC cells are attached to the cell surface by type 1 fimbriae and then invade the uroepithelium (240, 241) 1 to 3 h after the initial inoculation. Localized actin rearrangements occur and engulf the bound organism via zipper-like phagocytosis (240). After being internalized in the murine superficial bladder cell, UPEC replicates rapidly, forming clusters known as early IBCs (175). Recently, type 1 fimbriae have been shown to have an additional intracellular role during this stage of IBC formation (460). As IBCs mature, around 6 to 8 h after inoculation of the murine bladder (175), they more closely resemble classical biofilm structures (88), where the bacterial doubling time is increased (from approximately 30 to 60 min) and the bacterial cell length is shortened (0.7 µm versus 3 µm). At this stage, pod-like protrusions are observed on the surface of murine bladder epithelial cells (8). Around 12 h postinoculation, bacterial detachment is observed (175) as either a whole community or individual highly motile cells that burst out of the murine bladder lumen in a process referred to as fluxing (7). It is postulated that IBCs and biofilms contribute to the persistence of these organisms due to the increase in resistance to antibiotics and the host immune response. IBC formation has not yet been substantiated in humans.

There are several factors that are known to contribute to the formation of biofilms by E. coli. These include fimbriae, curli, flagella, antigen 43, and extracellular matrix molecules including cellulose, colanic acid, and poly-?-1,6-N-acetyl-D-glucosamine (67, 68, 74, 81, 437, 469). Specifically, biofilm formation mediated by type 1 fimbriae may assist in the colonization of urinary catheter surfaces (271).

There have been recent studies examining biofilm formation on catheters and UPEC. Ferrières et al. (97) showed that certain catheter materials such as silicone and silicone-latex actually select for and promote biofilm formation for the most virulent UPEC strains, whereas asymptomatic bacteriuria strains form better biofilms on polystyrene and glass (Fig. 3). Koseoglu et al. (194) revealed that UPEC type O4 had formed mature biofilms after 12 to 24 h and developed biofilms completely in almost all latex/silicone balloon catheter samples after 4 to 7 days as examined by scanning electron microscopy.


Ospedale Pediatrico Bambino Gesu 5 years ago

In the Trendelenburg position the body is laid flat on the back (supine position) with the feet higher than the head, in contrast to the reverse Trendelenburg position, where the body is tilted in the opposite direction. This is a standard position used in abdominal and gynecological surgery. It allows better access to the pelvic organs as gravity pulls the intestines away from the pelvis. It was named after the German surgeon Friedrich Trendelenburg.[1] It is not recommended for the treatment of hypovolaemic shock.

Uses

Hypotensive patients (patients with low blood pressure) have historically been placed in the Trendelenburg position in hopes of increasing their cerebral perfusion pressure (the blood pressure in the brain). A 2005 literature review found the "Literature on the position was scarce, lacked strength, and seemed to be guided by 'expert opinion.'"[3] A 2008 meta-analysis found adverse consequences to the use of the Trendelenburg position and recommended it be avoided.[4] However, the passive leg raising test is a useful clinical guide to fluid resuscitation and can be used for effective autotransfusion.[5]

The Trendelenburg position used to be the standard first aid position for shock.[6]

The Trendelenburg position was used for injured scuba divers.[7] Many experienced divers still believe this position is appropriate, but current scuba first aid professionals no longer advocate elevating the feet higher than the head. The Trendelenburg position in this case increases regurgitation and airway problems, causes the brain to swell, increases breathing difficulty, and has not been proven to be of any value.[8] "Supine is fine" is a good, general rule for victims of submersion injuries unless they have fluid in the airway or are breathing, in which case they should be positioned on the side.

Perhaps because of its effect on breathing difficulty and airway problems, the Trendelenburg position is used in waterboarding.

The Trendelenburg position may be used in childbirth when a woman's cervix is too swollen and won't quite dilate to 10 centimeters, or during the incidence of a prolapsed umbilical cord to take pressure off the cord and get more oxygen to the fetus, or it can be used to help rotate a posterior fetus either during pregnancy or the birth itself.

Trendelenburg position is helpful in surgical reduction of an abdominal hernia.[9]

The Trendelenburg position is also used when placing a Central Venous Line.[10] Trendelenburg position uses gravity to assist in the filling and distension of the upper central veins when placing a central line in the internal jugular or subclavian veins. It is also used in the placement of an external jugular peripheral line for the same reason. It plays no role in the placement of a femoral central venous line.


Winnipeg Regional Health Authority 5 years ago

position /po·si·tion/ (pah-zish´un)

1. a bodily posture or attitude.

2. the relationship of a given point on the presenting part of the fetus to a designated point of the maternal pelvis.

anatomical position that of the human body standing erect with palms turned forward, used as the position of reference in designating the site or direction of structures of the body.

Bozeman's position the knee-elbow position with straps used for support.

decubitus position see decubitus.

Fowler's position that in which the head of the patient's bed is raised 18–20 inches above the level, with the knees also elevated.

knee-chest position the patient resting on knees and upper chest.

knee-elbow position the patient resting on knees and elbows with the chest elevated.

lithotomy position the patient supine with hips and knees flexed and thighs abducted and externally rotated.

Mayer position a radiographic position that gives a unilateral superoinferior view of the temporomandibular joint, external auditory canal, and mastoid and petrous processes.

Rose's position a supine position with the head over the table edge in full extension, to prevent aspiration or swallowing of blood.

semi-Fowler position one similar to Fowler's position but with the head less elevated.

Sims position the patient on the left side and chest, the right knee and thigh drawn up, the left arm along the back.

Trendelenburg position the patient is supine on a surface inclined 45 degrees, head at the lower end and legs flexed over the upper end.

verticosubmental position a radiographic position that gives an axial projection of the mandible, including the coronoid and condyloid processes of the rami, the base of the skull and its foramina, the petrous pyramids, the sphenoidal, posterior ethmoid, and maxillary sinuses, and the nasal septum.

Waters' position a radiographic position that gives a posteroanterior view of the maxillary sinus, maxilla, orbits, and zygomatic arches.

from

http://medical-dictionary.thefreedictionary.com/Tr...


Summa Health System 5 years ago

Use of the Trendelenburg Position as the Resuscitation Position: To T or Not to T?

By Natalie Bridges, RN, BSN and Adrian A. Jarquin-Valdivia, MD, RDMS

From the Neurointensive Care Unit, Vanderbilt University Medical Center, Nashville, Tenn.

Abstract

• Objective To review the literature on use of the Trendelenburg position as a position for resuscitation of patients who are hypotensive.

• Methods PubMed online, cited bibliographies, critical care textbooks, and Advanced Cardiac Life Support guidelines were searched for information on the position used for resuscitation. Because of the heterogeneity of the data, only pertinent articles and chapters were summarized.

• Results Eight peer-reviewed publications on the position used for resuscitation were found. Pertinent information from 2 critical care textbooks and from the Advanced Cardiac Life Support guidelines was included in the review. Literature on the position was scarce, lacked strength, and seemed to be guided by "expert opinion."

• Conclusion The general "slant" of the available data seems to indicate that the Trendelenburg position is probably not a good position for resuscitation of patients who are hypotensive. Further clinical studies are needed to determine the optimal position for resuscitation.

Shock is a relatively common life-threatening condition in out-of-hospital and in-hospital acute care settings such as emergency departments, operating rooms, and intensive care units. Optimal positioning of patients during the resuscitation period, either to maximize effort and outcome or to minimize further injury, seems like a basic consideration to bear in mind and is probably clinically relevant.

The Trendelenburg position was originally used to improve surgical exposure of the pelvic organs.1 It is credited to German surgeon Friedrich Trendelenburg (1844–1924).2 After World War I, use of the Trendelenburg position became common practice in managing patients with shock. The position was later used to prevent air embolism during central venous cannulation and to enhance the effects of spinal anesthesia.1

In the Trendelenburg position, the patient is supine and the head is tilted down, allowing the patient’s feet and legs to remain above the level of the heart. Health-care workers have continued to use this position on the assumption that it will divert blood from the lower extremities into the central circulation. The diversion of blood augments cardiac filling, central blood volume, and cardiac stroke volume, thus providing rapid and temporary management of shock.3

Data to support the use of the Trendelenburg position during shock are limited and do not reveal beneficial or sustained changes in systolic blood pressure or cardiac output.

An alternative position for resuscitation is the modified Trendelenburg position, or passive leg elevation.4 In this position, the patient is supine and the lower extremities are lifted up above the cardiac level (the degree of elevation remains unclear). Supposedly, in this position, blood is displaced from the veins in the lower extremities into the central body compartment. In consequence, right and left ventricular preloads, stroke volume, and cardiac output are increased.5

With the increasing emphasis on evidence-based practice,6,7 we reviewed the published literature to summarize recent views and clinical studies on the use of the Trendelenburg position for resuscitation of patients who have hypotension or shock.

Methods

We searched PubMed for the years 1966 through 2004. We limited the search to articles in the English language, on humans and used the following search criteria: (shock OR hypotension) AND Trendelenburg position, and (shock OR hypotension) AND resuscitation position.

Articles pertinent to the issue of resuscitation in shock, hypotension, or both were extracted. The bibliographies in these articles were used to find other publications.

from

http://ajcc.aacnjournals.org/content/14/5/364.full...


Children's Medical Center of Dallas 5 years ago

Background When the level achieved by a spinal anaesthetic is too low to perform surgery, patients are usually placed in the Trendelenburg position. However, cephalad spread of the hyperbaric spinal anaesthetics may be limited by the lumbar lordosis. The Trendelenburg position with the lumbar lordosis flattened by hip flexion was evaluated as a method to extend the analgesic level after the administration of hyperbaric local anaesthetic.

Methods When the pinprick block level was lower than T10 5 min after intrathecal injection of hyperbaric bupivacaine (13 mg), patients were recruited to the study and randomly allocated to one of the two positions: the Trendelenburg position with hip flexion (hip flexion group, n = 20) and the Trendelenburg position without hip flexion (control group, n = 20). Each assigned position was maintained for 5 min and then patients were returned to the horizontal supine position. Spinal block level was assessed by pinprick, cold sensation, and modified Bromage scale at intervals for the following 150 min.

Results The maximum level of pinprick and cold sensory block [median (range)] was higher in the hip flexion group [T4 (T8–C6) and T3 (T6–C2)] compared with the control group [T7 (T12–T4) and T5 (T11–T3)] (P < 0.001). The maximum motor blockade median (range) was not different between the two groups being 3 (3–3) in the hip flexion group vs 3 (0–3) in the control group.


U. S. Air Force Regional Hospital 5 years ago

Trendelenburg position

Type: Term Pronunciation: tren?d?-l?n-b?rg Definitions: 1. a supine position in which the feet are higher than the head; used in patients who become acutely hypotensive.

Found on http://www.medilexicon.com/medicaldictio

Trendelenburg position

In the `Trendelenburg position` the body is laid flat on the back (supine position) with the feet higher than the head, in contrast to the `reverse Trendelenburg position`, where the body is tilted in the opposite direction. This is a standard position used in abdominal and gynecological surgery. It allows better access to the pelvic organs as gravity pulls the intestines towards the head. It was named after the German surgeon Friedrich Trendelen...

Found on http://en.wikipedia.org/wiki/Trendelenbu

Trendelenburg position

one in which the patient is on the back on a table or bed whose upper section is inclined 45 degrees so that the head is lower than the rest of the body; the adjustable lower section of the table or bed is bent so that the patient's legs and knees are flexed. There is support to keep the patient from slipping.

Found on http://www.mercksource.com/pp/us/cns/cns

Trendelenburg Position

A position in which an individual is laid flat on the back with their feet higher than the head. This position is used during pregnancy when a woman is at risk for delivering the baby prematurely. The position may also be used in labor when the cervix is swollen and will not dilate to a full 10 centimeters or when the baby is lying in an unfavora...

Found on http://www.pregnology.com/AZ/T/4

Trendelenburg's position

A supine position on the operating table, which is inclined at varying angles so that the pelvis is higher than the head with the knees flexed and legs hanging over the end of the table; used during and after operations in the pelvis or for shock. ... (05 Mar 2000) ...

Found on http://www.mondofacto.com/facts/diction


Complejo Hospitalario Universitario de Albacete 5 years ago

Use of the Trendelenburg position by critical care nurses: Trendelenburg survey

CL Ostrow

Abstract

BACKGROUND: Little evidence indicates that changing a patient's body position to the Trendelenburg (head lower than feet) or the modified Trendelenburg (only the legs elevated) position significantly improves blood pressure or low cardiac output. This intervention is still used and is often the first measure implemented for treatment of hypotension. OBJECTIVES: The purpose of this research was to assess the degree of use of Trendelenburg positions by critical care nurses, the clinical uses of these positions, and the sources of knowledge and beliefs of nurses about the efficacy of the positions. METHOD: A survey was mailed to 1000 nurses whose names were randomly selected from the membership list of the American Association of Critical-Care Nurses. RESULTS: The return rate was 49.4%. Ninety-nine percent of the respondents had used the Trendelenburg position, and 80% had used the modified Trendelenburg position, mostly for treatment of hypotension. Most used this intervention as an independent nursing action, and most learned about these positions from their nursing education, nurse colleagues, supervisors, and physicians. The Trendelenburg position was used for many nonemergent reasons; the most frequent use was for insertion of central IV catheters. Although 80% of the respondents believed that use of the Trendelenburg position improves hypotension almost always or sometimes, many respondents recognized several adverse effects associated with use of this position. DISCUSSION AND CONCLUSIONS: The results provide evidence that tradition-based therapy still underlies some interventions used in the care of critically ill patients and that some nurses may be relying on an outdated knowledge base that is not supported by the current literature.


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D.Virtual.Doctor 5 years ago from Europe Author

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