Claim: Coronary artery bypass surgery is performed to relieve angina not well-controlled by medication, to prevent or relieve left ventricular dysfunction, and/or to reduce the risk of death, and there are two methods of performing this surgery.
Evidence: Coronary artery bypass surgery, also known as coronary artery bypass graft (CABG, pronounced "cabbage") surgery, and colloquially heart bypass or bypass surgery, is a surgical procedure to restore normal blood flow to an obstructed coronary artery. There are two main approaches. CABG or stent placement is indicated when medical management - anti-angina medications, statins, antihypertensives, smoking cessation, and/or tight blood sugar control in diabetics - do not satisfactorily relieve ischemic symptoms. In this method, the artery is "pedicled" which means it is not detached from the origin. In the other, a great saphenous vein is removed from a leg; one end is attached to the aorta or one of its major branches, and the other end is attached to the obstructed artery immediately after the obstruction to restore blood flow.