Common Arterial Trunk with Intact Ventricular Septum: Morphologic and Developmental Considerations

Area of Science:

• Cardiology
• Congenital Heart Disease
• Pediatric Cardiology

Background:

• Common arterial trunk (CAT) with an intact ventricular septum (IVS) is a rare congenital heart defect.
• It can be misdiagnosed as other conditions like hypoplastic left heart syndrome with aortic atresia.
• Existing data is limited to case reports and small series.

Purpose of the Study:

• To systematically review reported cases of CAT with IVS.
• To objectively group these cases using cluster analysis based on morphologic findings.
• To identify distinct patterns of CAT with IVS.

Main Methods:

• Systematic literature review to identify relevant cases.
• Inclusion of cases with available individual data for analysis.
• K-means cluster analysis to group hearts based on morphology.

Main Results:

• K-means clustering revealed three distinct groups of CAT with IVS.
• The primary differentiator was the ventriculo-arterial junction's commitment to the left, right, or both ventricles.
• Cases committed to one ventricle showed hypoplasia or atresia of related structures of the other ventricle.

Conclusions:

• Distinct morphologic patterns exist for CAT with IVS.
• These patterns are determined by the ventricular support of the common ventriculo-arterial junction.
• Understanding these patterns is crucial for accurate diagnosis and management.