Which statement about atrialization in Ebstein anomaly is correct?

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Multiple Choice

Which statement about atrialization in Ebstein anomaly is correct?

Downward displacement of the tricuspid valve into the right ventricle creates an atrialized portion of the ventricle. This means part of the RV above the displaced valve leaflets is incorporated into the right atrium and behaves as atrial tissue, enlarging the right atrium and reducing the functional right ventricle. This mechanism is what the statement describes as atrialization. The other described findings—left ventricular hypertrophy, aneurysm of the interventricular septum, or dilation of the aorta—are not features of atrialization in Ebstein anomaly and do not explain this specific change in the right heart anatomy.

Downward displacement of the tricuspid valve into the right ventricle creates an atrialized portion of the ventricle. This means part of the RV above the displaced valve leaflets is incorporated into the right atrium and behaves as atrial tissue, enlarging the right atrium and reducing the functional right ventricle. This mechanism is what the statement describes as atrialization. The other described findings—left ventricular hypertrophy, aneurysm of the interventricular septum, or dilation of the aorta—are not features of atrialization in Ebstein anomaly and do not explain this specific change in the right heart anatomy.

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