Claim: Coronary artery bypass surgery is performed to relieve angina, a condition in which there is chest pain or pressure, usually due to not enough blood flow to the heart muscle, 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. Angina, also known as angina pectoris, is chest pain or pressure, usually due to not enough blood flow to the heart muscle. CABG is performed to relieve angina unsatisfactorily controlled by maximum tolerated anti-ischemic medication, prevent or relieve left ventricular dysfunction, and/or reduce the risk of death. There are two main approaches.