Echocardiographic assessment of atrioventricular canal defects

Area of Science:

• Pediatric Cardiology
• Congenital Heart Disease
• Cardiac Anatomy

Background:

• Atrioventricular canal defects (AVCD) result from abnormal development of endocardial cushions.
• These defects typically involve a primum atrial septal defect (ASD), inlet ventricular septal defect (VSD), and a common atrioventricular valve.

Purpose of the Study:

• To elucidate the anatomical classifications of AVCD based on deformity variations.
• To highlight the diagnostic utility of specific echocardiographic views for AVCD.

Main Methods:

• Review of anatomical classifications for partial, transitional, intermediate, and complete common AVCD (balanced/unbalanced).
• Classification of balanced complete AVCDs (Rastelli A, B, C) based on leaflet anomalies.
• Identification of echocardiographic views (apical, subcostal, parasternal) for imaging AVCD.

Main Results:

• AVCD variations lead to diverse anatomical classifications, including partial, transitional, intermediate, and complete forms.
• Balanced complete AVCDs are categorized as Rastelli A, B, or C.
• Unbalanced complete AVCDs are defined by the common atrioventricular valve's predominant connection to the right or left ventricle.
• Specific echocardiographic views are optimal for visualizing AVCD anatomy.

Conclusions:

• Understanding AVCD anatomical variations is key to classification.
• Echocardiography provides essential views for diagnosing and characterizing AVCD.
• Accurate imaging aids in determining appropriate surgical repair strategies for AVCD.