Ebstein's anomaly

Ebstein's anomaly is a rare heart defect in which the tricuspid valve — the valve between the upper right chamber (right atrium) and the lower right chamber (right ventricle) of the heart — isn't formed properly. As a result, blood leaks back through the valve and into the right atrium. Atrial septal defect, the most common associated defect with Ebstein's anomaly, is a hole between the two upper chambers of the heart.

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