In this video, Dr. OP. Yadava, Chief Executive Officer & Chief Cardiac Surgeon, National Heart Institute, New Delhi, Talks about the chances of heart attack after bypass surgery during the first year. He will explain that in various studies, it is shown that bypass surgery does not reduce the total incidence of heart attack. It only reduces the incidences of fatal heart attacks but overall heart attacks are not reduced. The reason behind it is that the side branches, the microcirculation, each coronary arteries branches 10 – 14 times before it becomes a capillary, all these are not bypassed. The cholesterol can also saturates in major arteries as well as microcirculation. Even after bypass surgery, there are certain areas which continues to be ischemic. If the graft has failed, then 3% of patients might get a heart attack within a year.