Definition of Septal defect, atrial (ASD)
Septal defect, atrial (ASD): A hole in the septum, the wall, between the atria, the upper chambers of the heart. Commonly called an ASD. ASDs are a major class of heart deformity that is present at birth (congenital cardiac malformation).Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012
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