Atrial Septal Defect
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Atrial Septal Defect (ASD)
ASD is a hole in the part of the septum that separates the atria—the upper chambers of the heart. This heart defect allows oxygen-rich blood from the left atrium to flow into the right atrium instead of flowing to the left ventricle as it should. Many children who have ASDs have few, if any, symptoms.
Source: National Heart Lung and Blood Institute, U.S. Department of Health and Human Services, National Institute of Health. www.nhlbi.nih.gov
Normal structure and blood flow in the interior of the heart
Heart with an atrial septal defect,
which allows oxygen-rich blood from the left atrium to mix with oxygen-poor blood from the right atrium.
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