This depends on the degree of atrioventricular septal defect.
However, in general, the patient is put on cardiopulmonary bypass, so the heart
can be temporarily stopped and operated on. This allows the surgeon(s) to place one or two patches within the heart to seal the atrial and ventricular defects. A valve
repair is then performed on the tricuspid and/or mitral valves.
Answer assisted by David Escobar, Medical Student