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When lithium hurts: a look at Ebstein anomaly.

Stephen Osiro¹, Kevin J Tiwari, Njambi Mathenge

¹Department of Medicine, Woodhull Medical and Mental Health Center, Brooklyn, NY 11206, USA. berilonson@gmail.com

Cardiology in Review

|December 28, 2012

Summary

Ebstein anomaly is a rare congenital heart defect affecting the tricuspid valve and right ventricle. Management focuses on tricuspid valve repair for better long-term outcomes in patients with this condition.

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Area of Science:

Cardiology
Congenital Heart Disease
Cardiac Surgery

Background:

Ebstein anomaly (EA) is a rare congenital heart defect (<1.5% of all congenital heart diseases) characterized by apical displacement of tricuspid valve (TV) leaflet attachments.
This displacement leads to three distinct right heart morphologic components: the right atrium proper, the atrialized right ventricle (RV), and the functional RV.
EA is considered a genetically heterogeneous condition, likely resulting from failed delamination of TV leaflets from the myocardium and interventricular septum.

Purpose of the Study:

To provide a comprehensive overview of Ebstein anomaly, including its pathophysiology, diagnostic modalities, and current management strategies.
To highlight the preferred approach of tricuspid valve repair over replacement for Ebstein anomaly.
To identify the need for further research comparing different TV repair techniques in EA patients.

Main Methods:

Review of current literature and expert opinions on Ebstein anomaly.
Description of characteristic electrocardiographic findings in EA.
Discussion of diagnostic imaging techniques, primarily echocardiography and cardiac magnetic resonance imaging.

Main Results:

EA presents with specific ECG findings: tall, broad, right atrial P waves, prolonged PR intervals, and deep right precordial Q waves.
Echocardiography is the primary diagnostic tool, with cardiac MRI emerging as a valuable alternative.
Management strategies are tailored to patient age, disease severity, and associated cardiac abnormalities.

Conclusions:

Tricuspid valve repair is generally preferred over valve replacement in Ebstein anomaly due to its favorable long-term prognosis.
While current management strategies exist, a large randomized study is necessary to compare the efficacy of various TV repair techniques in EA patients.