Coronary Artery Bypass Grafting Surgery (CABG)/open heart surgery: If your physician diagnoses significant coronary artery disease that cannot be treated with medication and/or angioplasty, Coronary Artery Bypass Grafting (CABG) may be recommended. Bypass surgery is an operation in which surgeons create a bypass (detour) to allow blood to go around blockages in the coronary arteries. A blood vessel from your leg or chest, or an artery from your arm is sewn onto your coronary artery below the blockage. The narrowed/blocked area of the artery is not removed. Bypassing the obstructed area in the coronary artery will improve the blood supply to the heart muscle, therefore, reducing the symptoms caused by the lack of blood supply to the heart. Removal of the leg or chest vessel, or artery from the arm will not affect blood circulation in that specific area.