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Atrial Septal Defect (ASD)

Atrial Septal Defect (ASD) Symptoms and Causes

Atrial septal defect (ASD) is a congenital heart defect in which the wall that separates the upper heart chambers (atria) does not close completely. ASD may not require treatment if there are few or no symptoms, or if the defect is small. Surgical closure of the defect is recommended if the defect is large, the heart is swollen or if symptoms occur.