The surgeries done on the vessels of heart by the cardiac surgeons are known as cardiac surgery. Cardiac surgeries are implemented to treat ischemic heart diseases, congenital heart diseases, rheumatic heart disease including endocarditis. It also includes heart transplantation. Cardiopulmonary bypass techniques has reduced the mortality rates of these surgeries to relatively low ranks. Coronary artery bypass grafting (CABG) is the most common type of heart surgery. CABG improves blood flow to the heart. Surgeons use CABG to treat people who have severe coronary heart disease (CHD).