Coronary bypass surgery is a surgical procedure that diverts the flow of blood around a section of a blocked or partially blocked artery in your heart. By creating a new pathway to the heart, coronary bypass surgery improves blood flow to your heart muscle.
During coronary bypass surgery, a healthy blood vessel is taken from your leg, arm or chest and connected to the other arteries in your heart so that blood bypasses the diseased or blocked area.
After coronary bypass surgery, symptoms, such as chest pain and shortness of breath due to poor blood flow to the heart, generally improve. For some people, coronary bypass surgery may improve heart function and reduce the risk of dying of heart disease.
Mayo Clinic's approach