Spontaneous resolution of the septal defects in atrioventricular septal defect.

It is known that atrial septal defects of the secundum type and ventricular septal defects may undergo spontaneous closure. However, it is not well recognized that atrioventricular septal defects may infrequently also undergo spontaneous resolution. We report one case of complete atrioventricular septal defect that underwent spontaneous closure of the ventricular component. We also describe one case of partial atrioventricular septal defect with almost complete spontaneous resolution of the interatrial communication. Presence of shunting across the defects is demonstrated by color Doppler echocardiography, along with later absence of shunting. The rate of spontaneous resolution is estimated.