atrioventricular septal defect OMIM:614474 OMIM:614430 MESH:D004694 OMIM:606215 ORDO:98722 A congenital heart septal defect characterized by an abnormal or inadequate fusion of the superior and inferior endocardial cushions with the mid portion of the atrial septum and the muscular portion of the ventricular septum, thus allowing extra blood to circulate the lungs. DOID:0050651 GARD:802 ICD10CM:Q21.2 SNOMEDCT_US_2020_03_01:204322008 Xref MGI. OMIM mapping confirmed by DO. [SN]. AVCD OMIM:600309 disease_ontology AVSD ECD ICD9CM:745.6 UMLS_CUI:C0014116 atrioventricular canal defect endocardial cushion defect heart septal defect