Cardiac Bypass - According to the American Heart Association 427,000 coronary Cardian Bypass surgeries were performed in the United States in 2004, making it one of the most commonly performed major operations. CABG surgery is advised for selected groups of patients with significant narrowings and blockages of the heart arteries (coronary artery disease). CABG surgery creates new routes around narrowed and blocked arteries, allowing sufficient blood flow to deliver oxygen and nutrients to the heart muscle. .