Question

why must great care be taken to ensure that the vein replacing the coronary vein is the correct way round

Answer 1

In a typical heart bypass surgery, surgeons will use an artery from your chest or veins from your leg to deviate blood flow around narrowed sections of your coronary arteries to improve blood supply the heartThe bypass grafts are put in place by sewing one section of the artery or vein around a tiny opening just below the blockage in the diseased coronary artery and attaching the other end to a tiny opening made in the aortaWhen blood is unable to flow easily through the arteries of your heart, you may need to undergo coronary artery bypass surgery. ... Bypassing the blockages will supply the necessary oxygen, thereby relieving angina and increasing the function of the heart.