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Formation of an Ostium Primum Atrial Septal Defect

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OPENPediatrics Staff


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