MCQs - Cyanosis

Cyanosis of the Finger tips in Cyanotic phase of Raynaud's Phenomenon

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Cyanosis is the bluish discolouration of skin or mucous membrane caused by excess amounts of reduced hemoglobin (more than 5 mg %) or abnormal hemoglobin in the blood

This hub contain a few multiple choice questions based on cyanosis. This will help the students preparing for medical, dental, nursing or allied health exams

Diminished arterial oxygen saturation results in the following type of cyanosis:

  • Central

  • Peripheral

  • Cyanosis due to abnormal pigments

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    Answer: Central Cyanosis

Cyanotic Neonate

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Cutaneous vasoconstriction due to low cardiac output results in the following type of cyanosis:

  • Central

  • Peripheral

  • Cyanosis due to abnormal pigments

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    Answer: Peripheral

Did you know?

There are four different types of cyanosis

  • Central

  • Peripheral

  • Cyanosis due to abnormal pigments

  • Mixed.

In an adult, there is 15g% of haemoglobin, 95% of which is saturated with oxygen. That is why in a normal healthy individual, the colour of the skin and mucous membrane is pink. Reduced haemoglobin is that form of haemoglobin in red blood cells after the oxygen of oxyhemoglobin is released in the tissues. When the amount of reduced Hb is increased in the capillaries, the blood appears dark and the tissues get a bluish hue. This bluish discoloration can easily be detected in areas with increased capillary circulation such as palate, tongue, inner sides of the lips and conjunctiva.

Normal haemoglobin has iron in the ferrous form. In methaemoglobunaemia, iron is in the ferric form.

Central Cyanosis will NOT be evident on:

  • Conjunctiva

  • Lips

  • Nails

  • Tongue

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    Answer: Nails

Temperature of the extremities will be cold in the following type of cyanosis:

  • Central

  • Peripheral

  • Cyanosis due to abnormal pigments

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    Answer: Peripheral

Clubbing and polycythemia is usually associated with:

Central Cyanosis

Peripheral Cyanosis

Cyanosis due to abnormal pigments

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Answer: Central Cyanosis

Breathing pure oxygen decreases cyanosis in:

Central Cyanosis

Peripheral Cyanosis

Cyanosis due to abnormal pigments

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Answer: Central Cyanosis

Cyanosis in a baby with Hypoplastic Left Heart Syndrome

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In high altitude, low partial pressure of oxygen can lead to:

Central Cyanosis

Peripheral Cyanosis

Cyanosis due to abnormal pigments

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Answer: Central Cyanosis

Fallot’s tetralogy can lead to:

  • Central Cyanosis

  • Peripheral Cyanosis

  • Cyanosis due to abnormal pigments

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    Answer: Central Cyanosis

Congestive cardiac failure can lead to:

  • Central Cyanosis

  • Peripheral Cyanosis

  • Cyanosis due to abnormal pigments

    --------------------------------------------------

    Answer: Central Cyanosis

Chronic Obstructive Lung Disease can lead to:

  • Central Cyanosis

  • Peripheral Cyanosis

  • Cyanosis due to abnormal pigments

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    Answer: Central Cyanosis

Cyanosis of the right foot distal to an occlusion caused by acute arterial thrombosis of the right leg

Source

Shock can lead to:

  • Central Cyanosis

  • Peripheral Cyanosis

  • Cyanosis due to abnormal pigments

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    Answer: Peripheral Cyanosis

Methaemoglobunaemia can lead to:

  • Central Cyanosis

  • Peripheral Cyanosis

  • Cyanosis due to abnormal pigments

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    Answer: Cyanosis due to abnormal pigments

The following are the Factors altering Cyanosis:

  • Colour of the cutaneous pigment – It is easy to identify cyanosis in fair skinned people than in dark coloured people

  • Thickness of the skin- Thickness of the skin may mask cyanosis to some extent.

  • State of cutaneous capillaries

Conclusion:

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