Bypass surgery, also known as coronary artery bypass grafting (CABG), is a surgical procedure used to improve blood flow to the heart muscle in patients with coronary artery disease. During the surgery, a healthy blood vessel is taken from another part of the body and attached to the blocked or narrowed coronary artery, creating a new pathway for blood to flow to the heart. This procedure is often recommended for patients with severe coronary artery disease who have not responded well to other treatments such as medication or lifestyle changes. Bypass surgery can help relieve symptoms such as chest pain (angina) and reduce the risk of heart attack and other complications associated with blocked coronary arteries.