Coronary heart disease, which has become the number one killer in western countries at present, is also increasing in China with the improvement of living standards. Coronary artery bypass grafting, the most effective method for treating coronary heart disease internationally, has a history of more than thirty years. In recent years, coronary artery bypass surgery has been widely carried out in our hospital and has achieved very good results. However, most people do not know much about this surgery and are more or less afraid of it. What is coronary heart disease? Every organ in our body needs adequate blood circulation. The heart also needs an adequate supply of blood. The blood vessels that supply the heart are the left and right coronary arteries, and the left coronary artery is divided into two branches: the anterior descending branch and the circumflex branch. Coronary artery disease is a narrowing or blockage of the coronary arteries that reduces the blood supply to the heart. In severe cases, even minor activities such as eating and dressing are restricted, and myocardial infarction and sudden death may occur. What are the methods of treating coronary heart disease: Depending on the condition, doctors may choose medication, interventional therapy, surgery and so on. Coronary artery bypass grafting is the most effective treatment. Which patients need coronary artery bypass surgery? In general, coronary artery stenosis of less than 50% has little effect on blood flow, while stenosis up to 75% can significantly affect blood flow and produce angina symptoms. Therefore, any single coronary artery stenosis up to 75%, or two or more stenoses greater than 50%, need to perform coronary artery bypass surgery, and after interventional treatment and then occurrence of angina, also need to promptly perform bypass surgery. Ventricular wall tumors formed after myocardial infarction can have serious consequences and must be surgically removed as soon as possible, and coronary artery bypass surgery is performed at the same time as the removal of ventricular wall tumors. What is bypass surgery? Coronary artery stenosis in coronary artery disease is mostly segmental and mainly located in the proximal and middle segments of the coronary artery, while the distal segments are mostly normal. Coronary artery bypass surgery is to create a bypass at both ends of the narrowed or blocked coronary artery so that blood can bypass the stenosis and reach the front to supply myocardial nutrition. This bypass is usually made from the saphenous vein, internal mammary artery, right gastroretinal artery, radial artery, and inferior abdominal wall artery. The procedure is usually performed in an extracorporeal circulation with the heart stopped beating. However, coronary artery bypass surgery can now be performed with a beating heart.