An atrioventricular septal defect (AVSD) is a heart defect in which there are holes between the chambers of the right and left sides of the heart, and the valves that control the flow of blood between these chambers may not be formed correctly.

What is the difference between AVSD and ASD?

Atrioventricular septal defect (AVSD), also referred to as endocardial cushion defects, consists of three defects in the heart: An atrial septal defect (ASD), a hole in the “wall” (septum) of the heart that separates the two upper chambers (the atria).

What is the difference between VSD and AVSD?

In AV septal defect: There is a hole in the wall between the right and left atria (atrial septal defect, ASD). There is a hole in the wall between the right and left ventricles (ventricular septal defect, VSD).