Atrioventricular septal defect after surgical resection of a subaortic shelf.

Left ventricular to right atrial (LV-RA) communications are rare septal defects. The majority of them are congenital in origin and acquired defects are exceedingly rare. The causes of acquired LV-RA communications include chest trauma, infective endocarditis, and valvar replacement. This report describes a case of direct LV-RA and interventricular communications occurring three months after excision of a subaortic shelf.