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Atrial septal defect
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Atrial septal defect

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Contributors: Ryan Hoefen MD, PhD
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The presence of a defect (opening) in the septum that separates the 2 atria of the heart with resultant flow. It can be congenital or acquired. Associated clinical issues may include flow of oxygenated blood from the left atrium to the right atrium, producing a volume overload on the right heart; flow of unoxygenated blood from the right atrium to the left atrium resulting in cyanosis; and/or traverse of emboli from the venous circulation to systemic circulation, causing a stroke, transient ischemic attack, or other embolic events.

For more information, see OMIM.


Q21.1 – Atrial septal defect

70142008 – Atrial Septal Defect

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Last Updated: 03/29/2017
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Atrial septal defect
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Atrial septal defect : Exertional dyspnea, Heart murmur, Heart palpitations, Atrial enlargement
Imaging Studies image of Atrial septal defect
Cardiac MRI without contrast demonstrates opening in atrial septum, consistent with atrial septal defect.
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