Services Cardiac Services Cardiac Treatment areas CABGCoronary artery bypass surgery, is a surgical procedure to restore normal blood flow to an obstructed coronary artery. VALVE REPLACEMENTValve replacement surgery is the replacement of one or more of the heart valves with either an artificial heart valve or a bioprosthesis. ASDAtrial septal defect surgery is a type of minimally invasive heart surgery performed on atrial septal defect (ASD) with an endoscopic, closed chest approach.