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Open-heart surgery is any quite surgery during which a surgeon makes an outsized incision (cut) within the chest to open the skeletal structure and operate the heart. "Open" refers to the chest, not the heart. Depending on the sort of surgery, the surgeon also may open the heart. Cardiopulmonary bypass was developed after surgeons realized the limitations of hypothermia in cardiac surgery: Complex intracardiac repairs take time, and the patient needs blood flow to the body, as well as heart and lung function. Coronary artery bypass grafting, also called revascularization may be a common surgery to make an alternate path to deliver blood supply to the heart and body, with the goal of preventing clot formation.