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Formation of an Ostium Primum Atrial Septal Defect
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Description
A primum atrial septal defect (ASD) represents a deficiency of endocardial cushion tissue. An extension of endocardial cushion tissue does not form to join septum primum and a gap is left in the inferior posterior portion of the atrial septum, resulting in an ASD.
Last reviewed: June 2, 2015.
Topics: Cardiology Neonatology