Coronary artery bypass grafting (CABG) is a surgical procedure that improves blood flow to the heart. It is used to treat those who have severe coronary heart disease (CHD) or coronary artery disease.

The CABG procedure takes a healthy artery or vein from the body and it is grafted to the blocked coronary artery. The grafted artery or vein bypasses the blocked portion of the coronary artery so that an oxygen rich blood flow route can go around the blockage of the heart muscle.