Atrioventricular septal defect and tetralogy of Fallot

**Definition:** A congenital cardiac malformation with both an atrioventricular septal defect (atrioventricular canal defect) and tetralogy of Fallot.

Additional information: tetralogy of Fallot with atrioventricular septal defect (common atrioventricular canal defect) is always the complete form (unrestrictive interventricular component) and very few or no attachments of the superior bridging leaflet to the crest of ventricular septum.