Monarch Disease Ontology entry MONDO_0006664 (atrial septal defect) can be described as follows. Interauricular communication is a congenital malformation characterized by a communication between the atrial chambers of the heart. Also known as: ASD, Atrial Septal Defects, atrial septum defect, atrioseptal defect, auricular septal defect, congenital atrial septal defect, interatrial septal defect, interauricular communication.