atrial septal defect 8 (Monarch Disease Ontology term MONDO_0013750) is any atrial heart septal defect in which the cause of the disease is a mutation in the CITED2 gene. Also known as: ASD8, CITED2 atrial heart septal defect, atrial heart septal defect caused by mutation in CITED2, atrial heart septal defect type 8, atrial septal defect type 8.