It is a surgical procedure in which blood vessels from another part of the body are blocked into an artery, thereby removing the blocked flow path and opening a bypass in the area of the coronary occlusion, and blood flowing down the stenosis with this graft again. Is established. That is why it is called a bypass link. Several factors are involved in performing CABG. The number of coronary arteries involved, the degree of failure with left ventricular dysfunction, the presence of other health problems, the patient's symptoms, and the history of treatment. Patients who have drug-resistant unstable angina, chronic stable angina with acute complications that disrupt the patient's life, patients who have positive exercise test and radioisotope scan in addition to angina, patients who have obvious narrowing of the main coronary artery They have the left. Patients with all three major coronary arteries involved. The lower saphenous vein of the knee is mostly used because it is similar in diameter to the coronary arteries and is removed through a longitudinal incision in the inner surface of the leg and thigh and separating its branches. The vein is then examined for sclerosis.