Atrial septal defect ostium primum
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [[2]]; Cafer Zorkun, M.D., Ph.D. [3]; Assistant Editor(s)-In-Chief: Kristin Feeney, B.S. [4]
Overview
An ostium primum defect or endocardial cushion defect usually occurs due to the failure in fusion of the septum primum with the endocardial cushion. This defect is commonly associated with other cardiac anomalies like ventricular septal defect and atrioventricular defect.