Quadruple Bypass surgery: If four coronary arteries comprise blockages, then 4 grafts are required to bypass them. Graft failure: Failure on the graft to productively connect the new artery on the heart can also take place. This emergency situation most frequently happens when the saphenous vein from the leg is https://www.diigo.com/item/note/ap57p/34a0?k=54f6a9969f0ac3f0a3a1894fd3cd83ef