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 Atrial septal defect (ASD) is a heart defect that is present at birth (congenital).

While the baby is in the womb, there is normally an opening between the upper chambers of the heart (atria) to allow blood to flow around the lungs. This opening usually closes around the time when the baby is born. If the opening does not close, the hole is called an atrial septal defect, or ASD.


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