Patient Question : Disease:Acute heart attack Description:Sudden acute heart attack on January 29, 2016. The hospital diagnosed the need for heart bypass surgery, but the patient itself varicose veins in the legs can not be taken, need to take the arterial blood vessels hope to provide help:Please ask the risk of surgery, the possible post-operative situation? Reply from Sun Ling: Hello! Your question is actually a question about the risk of heart bypass, in which several preoperative indicators have been used for many years in Europe to assess. These include: age, gender, preoperative renal insufficiency (to calculate GFR), cardiac surgery, chronic lung disease, perioperative patient status, peripheral arterial disease, insulin for diabetes, pulmonary hypertension, recent myocardial infarction, new functional NYHA class, angina classification, left ventricular function, emergency surgery, whether it is combined aortic surgery, whether it is single bypass surgery, etc. These indicators are filled in online and the resulting score can be used to initially determine the risk of the surgery.