Bypass surgery is required when there are multiple stenoses or diffuse stenoses in the coronary vessels of the heart that are not amenable to stenting or when stenting is not effective. If the patient has only a single coronary artery stenosis it can be treated with stenting. If the patient has diffuse or multiple coronary artery stenoses that cannot be treated with stents, bypass surgery is required. Cardiac bypass surgery is one of the larger surgical procedures and requires an open chest, which can result in a large incision for the patient. After the operation, patients should take good care of the wounds to avoid infection and inflammation, and take antiplatelet drugs according to the doctor’s instructions. When patients need bypass surgery, they should choose regular hospitals and be operated by experienced and professional doctors.