atrial septal defects

atrial septal defects
atrioseptal defects congenital cardiac anomalies in which there is persistent patency of the atrial septum due to failure of fusion between either the septum secundum or the septum primum and the endocardial cushions. In ostium secundum d. there is a rim of septum all around the defect. In ostium primum d., which is an incomplete form of atrioventricularis communis, there is no septum at the base of the defect, between the mitral and tricuspid valves; it is usually associated with a cleft mitral cusp and occasionally with a cleft tricuspid valve or a ventricular septal defect.

Atrial septal defects; cutaway composite view showing possible locations of ostium primum and secundum defects in the right atrium.


Medical dictionary. 2011.

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  • endocardial cushion defects — a spectrum of septal defects resulting from imperfect fusion of the endocardial cushions and ranging from persistent ostium primum to persistent complete common atrioventricular canal; see atrial septal d s and atrioventricularis communis …   Medical dictionary

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