Ebstein Anomaly and the Range of Right-Sided Heart Defects

Area of Science:

• Cardiology
• Congenital Heart Disease
• Genetics

Background:

• Ebstein anomaly (EA) is a rare congenital heart defect involving abnormal tricuspid valve (TV) and right ventricle (RV) development.
• It leads to TV displacement, RV hypoplasia, and potential cyanosis, regurgitation, arrhythmias, and heart failure.
• EA can be viewed as a cardiomyopathy and may share etiologies with other conditions like left ventricular non-compaction (LVNC).

Purpose of the Study:

• To review the current understanding of Ebstein anomaly, including its pathophysiology, diagnosis, and management.
• To highlight diagnostic advancements and persistent challenges, particularly in prenatal detection.
• To emphasize the need for further research into the etiology of EA.

Main Methods:

• Review of existing literature on Ebstein anomaly.
• Discussion of diagnostic modalities like echocardiography, cardiac MRI, and electrophysiological studies.
• Emphasis on the role of autopsy in fatal cases for diagnosis and counseling.

Main Results:

• Diagnostic tools have improved early identification, risk stratification, and management of EA.
• Challenges remain in prenatal diagnosis and distinguishing EA from other TV malformations.
• Autopsy remains critical for confirming diagnosis and understanding mortality in fatal EA cases.

Conclusions:

• While diagnostic and management strategies for Ebstein anomaly have advanced, significant knowledge gaps regarding its exact etiology persist.
• Further research into genetic, epigenetic, and environmental factors is essential.
• Understanding the pathogenesis will enable targeted treatments and improved patient outcomes.