has part has part characteristic of inheres in has modifier Atrial septal defect Atrioseptal defect Fyler:2050 Atrial septum defect SNOMEDCT_US:253366007 HP:0001631 SNOMEDCT_US:405752007 ASD UMLS:C0018817 HP:0001630 Hole in heart wall separating two upper heart chambers Defect in the atrial septum ICD-10:Q21.1 SNOMEDCT_US:70142008 Atrial septal defect (ASD) is a congenital abnormality of the interatrial septum that enables blood flow between the left and right atria via the interatrial septum. Atria septal defect An opening in the wall separating the top two chambers of the heart Abnormal cardiac atrium morphology Abnormal atrial septum morphology abnormal closure incomplete interatrial septum