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).
SEPTAL DEFECT, ATRIAL (ASD)
Meaning of SEPTAL DEFECT, ATRIAL (ASD) in English
English dictionary of medicine. Английский словарь медицины. 2012