Cardiac bypass, or coronary artery bypass grafting, is a relatively effective treatment for coronary heart disease. Common drawbacks include large surgical trauma, recurrence rate, serious postoperative complications, and high surgical costs. 1. Large surgical trauma: large surgical incisions, the need for general anesthesia during surgery, the establishment of extracorporeal circulation, and the operation time is longer, the operation is difficult. 2. Existence of recurrence rate: some patients have shorter maintenance time after transplantation, and may need to be operated again after 10~20 years. If the patients are older and suffer from underlying diseases, the risk of surgery is greatly increased. 3. Post-operative complications: common complications after heart bypass surgery include cardiac insufficiency, heart failure, metabolic acidosis, etc. 4. Expensive operation cost: preoperative examination cost, operation cost, postoperative monitoring cost, drug cost, etc. The comprehensive cost of bypass surgery is between 80,000~150,000 dollars, and there are individual differences. Cardiac bypass surgery is to establish a new pathway between the distal and proximal ends of the narrowed coronary arteries, thus restoring the normal blood flow. Whether or not to undergo cardiac bypass surgery should be considered on the basis of the doctor’s advice.