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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
http://www.medicinenet.com/script/main/art.asp?articlekey=5450
Last Editorial Review: 6/14/2012

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