Bleeding after cardiac surgery is a well-known serious complication. Cardiac surgical patients are particularly susceptible to postoperative mediastinal bleeding. Postoperative bleeding gradually tapers over the course of several hours in the majority of patients, but about 1–3% of patients will require re-exploration in the operating room for persistent mediastinal bleeding. Prompt and aggressive treatment upon arrival in the ICU may frequently arrest “medical bleeding,” but evidence of persistent or increasing amounts of bleeding should prompt early exploration. Re-exploration for bleeding is associated with prolonged hospital stay and increased complications e.g. sternal wound infection (SWI), renal impairment, and postoperative arrhythmias. Every effort should be exerted to avoid postoperative bleeding and to manage it properly if happens. Variability of perioperative blood loss and rate of re-exploration among centers and surgeons were reported Morbidity and mortality after cardiac surgery can be caused by excessive bleeding which is common and preventable cause.