Heart surgeries have evolved over the last few decades from a bloody messy affair to keyhole procedures. However, one thing remains constant with any cardiac procedure, the risk of re-exploration. By and large, postoperative bleeding is the number one cause leading to re-opening of the sternum for a second look. The study described in this book was done to assess this risk of re-exploration among patients of cardiac surgery and various factors associated with it. It also studies factors which affect the outcome following a re-exploration. At the end of the discussion, we would be enlightened about how to minimize the adverse effects of re-exploration and improve patient outcome.