What is the difference between open heart surgery and bye pass surgery?

Bypass surgery (CABG) as the name suggests is a surgical procedure in which blood vessel(s) from the chest or leg is/are grafted to the coronary artery beyond its most diseased segments. On the other hand, coronary angioplasty (PTCA) is a non-surgical procedure designed to widen/dilate a narrowed coronary artery. Which procedure need to be opt is decided by a doctor or medical expert depending on the several factors like number of arteries showing blockages, type of blockage, number of segments blocked, diameter of vessels and functioning of heart muscle etc. One has to choose the best form of treatment out of medication, bypass or angioplasty. More information is available here. http://hubpages.com/hub/Bypass-surgery-or-angiopla