Hello, Our heart has 3 blood supply. When there is a blockage in any of these vessel, it causes heart attack called Acute coronary syndrome. Generally, when there are one or two vessels are blocked then ideally go for drug elluting stents. By pass surgery is treatment of choice for triple vessel disease (if all three are blocked). Its very unlikely that By pass surgery is recommended for single vessel disease. But if Doctor advised for By pass surgery then there is no absolute contraindication for this. So, you can go for By pass surgery if there is no other risk factors associated with your patient. Thank You