Mimics of Ebstein's anomaly

Area of Science:

• Cardiology
• Medical Imaging

Background:

• Ebstein's anomaly is a rare tricuspid valve malformation.
• Other cardiac conditions can mimic Ebstein's anomaly, leading to misdiagnosis.
• Accurate differentiation is crucial for appropriate patient management and surgical planning.

Purpose of the Study:

• To identify discriminating clinical and echocardiographic features for diagnosing Ebstein's anomaly.
• To differentiate Ebstein's anomaly from other causes of tricuspid regurgitation.
• To highlight the surgical implications of correctly identifying Ebstein's anomaly mimics.

Main Methods:

• Retrospective review of clinical, echocardiographic, and surgical records of 22 patients misdiagnosed with Ebstein's anomaly.
• Comprehensive echocardiography was used to assess tricuspid valve morphology and function.
• Key echocardiographic parameters included septal tricuspid valve leaflet displacement and anterior leaflet characteristics.

Main Results:

• Twenty-two patients referred with suspected Ebstein's anomaly were found to have other tricuspid valve or right ventricular abnormalities.
• Exercise intolerance and atrial arrhythmias were common presenting symptoms.
• Absence of significant septal leaflet displacement (≥ 8 mm/m²) and a non-redundant anterior leaflet confidently excluded Ebstein's anomaly in all cases.
• Tricuspid regurgitation was attributed to valve dysplasia, prolapse, trauma, or other conditions.

Conclusions:

• Specific echocardiographic findings, namely the degree of septal leaflet displacement and anterior leaflet morphology, are critical for excluding Ebstein's anomaly.
• Correctly identifying mimics of Ebstein's anomaly has significant implications for surgical intervention.
• Comprehensive echocardiography is essential for accurate diagnosis and management of tricuspid valve abnormalities.