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Ebstein's anomaly in adults: Doppler-echocardiographic evaluation.

A systematic approach and segmental analysis are required for comprehensive assessment including both morphologic and functional abnormalities associated with Ebstein's anomaly. The essence of the disease is an apical displacement of both the septal and the posterior tricuspid leaflets, exceeding 20 mm or 8 mm/m2 in adults. As a consequence, the right heart consists of three components including the true right atrium, the functional right ventricle (RV) and an intervening zone that is anatomically ventricular but functionally right atrial (atrialized RV). The thin wall of the atrialized RV may result in an aneurysm between the anatomic tricuspid annulus and the apically displaced posterior leaflet. The annular attachment of the anterior leaflet is normal, which may be dysplastic and adherent to the RV wall. Tricuspid regurgitation is usually moderate to severe. Size, shape and function of the functional RV must be described. The paradoxical motion of the interventricular septum causes alterations in left ventricular geometry and function. An interatrial communication is frequently present. Echocardiography is the method of choice to diagnose Ebstein's anomaly on its own or in association with other heart defects.

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