An ostium primum atrial septal defect (ASD) occurs when then atrial septum near the atrioventricular valves has a communication between the two atrium causing a left to right shunt. This rarely ...

Case 1. A 17-year-old boy was admitted to Walter Reed General Hospital for repair of an ostium-primum defect of the interatrial septum with an associated cleft mitral valve and mitral insufficiency.