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Balanced Atrio Ventricular Canal Defect: Distilling the Data

Meena Nathan1, Alyssa Tutunjian2, Gerald Marx3

  • 1Department of Cardiac Surgery, Boston Children's Hospital, Boston, Massachusetts; Department of Surgery, Harvard Medical School, Boston, Massachusetts.

Seminars in Thoracic and Cardiovascular Surgery. Pediatric Cardiac Surgery Annual
|May 6, 2026
PubMed

Insights

Complete atrioventricular canal defect (CAVC), a common congenital heart issue, results from endocardial cushion fusion failure. This review covers its history, management evolution, surgical outcomes, and recent genetic and imaging advancements.

Area of Science:

  • Cardiology
  • Developmental Biology
  • Medical Genetics

Background:

  • Complete atrioventricular canal defect (CAVC) is the seventh most common congenital heart defect, occurring in approximately 1 in 1712 live births.
  • Embryologically, CAVC arises from the failure of endocardial cushion fusion, leading to complex cardiac abnormalities.
  • These abnormalities can affect the atrial septum, atrioventricular (AV) valve, subvalvar apparatus, and ventricular septum.

Purpose of the Study:

  • To provide a comprehensive overview of complete atrioventricular canal defect (CAVC).
  • To discuss the historical context and evolution of management strategies for CAVC.
  • To review current surgical outcomes and recent advancements in genetics and imaging for CAVC.

Main Methods:

  • Literature review focusing on historical timelines, management strategies, and surgical outcomes.
  • Discussion of embryological origins of CAVC.
  • Inclusion of recent advances in genetic and imaging techniques relevant to CAVC.

Main Results:

  • CAVC presents a spectrum of abnormalities due to endocardial cushion fusion failure.
  • Management strategies have evolved significantly over time.
  • Current surgical approaches offer improved outcomes for well-balanced CAVC patients.

Conclusions:

  • Understanding the embryological basis of CAVC is crucial for diagnosis and management.
  • Surgical intervention has advanced, leading to better outcomes for CAVC.
  • Future research directions include leveraging genetic and advanced imaging techniques for CAVC.

Keywords:
atrioventricular canal defectsimagingmanagement strategiesoutcomes

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