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Ebstein's Anomaly atrial septal defect, atrialized right ventricle, malformed tricuspid valve Associated with lithium exposure in 1st trimester

Ebstein's anomaly is a rare heart defect in which parts of the tricuspid valve are abnormal. The tricuspid valve is normally made of three parts, called leaflets or flaps. In patients with Ebstein's anomaly, the leaflets are larger and unusually deep in the right ventricle. The defect usually causes the valve to work poorly, and blood may go the wrong way back into the right atrium. The backup of blood flow can lead to heart swelling and fluid buildup in the lungs or liver.

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