What is "heart bypass surgery" or "bypass graft surgery"?

What is "heart bypass surgery" or "bypass graft surgery"?

Heart bypass surgery is a procedure in which a surgeon takes, either a vein from the arm or from the leg, or sometimes a small artery from the arm and uses that to create a channel around the blockage in the heart. One end of the vein or the artery is attached to the aorta, the main blood vessel coming out of the heart. And the other end is sown onto the coronary artery beyond where a blockage is. And then blood can flow freely from the aorta down to the heart muscle.Bypass operations can put bypasses into multiple arteries at a time. Several bypasses can be done during the same operation. And those bypasses have a good longevity. They tend to stay open quite well and to make people who have had multiple blockages, particularly multiple severe blockages in important large arteries safer in the long run.