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Unbalanced atrioventricular septal defects

D C Drinkwater1, H Laks

  • 1Department of Cardiothoracic Surgery, University of California, Los Angeles 90024-1741, USA.

Seminars in Thoracic and Cardiovascular Surgery
|January 1, 1997
PubMed
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Unbalanced atrioventricular canal defects present a spectrum of ventricular dominance. Early diagnosis and intervention, including surgical palliation, are crucial for favorable outcomes in single ventricle physiology.

Area of Science:

  • Pediatric Cardiology
  • Congenital Heart Disease
  • Cardiac Surgery

Background:

  • Atrioventricular canal defects (AV canal) typically feature balanced ventricular components.
  • Unbalanced AV canal presents with right or left ventricular dominance, creating a spectrum of severity.
  • Severe ventricular hypoplasia necessitates a single ventricle approach, while borderline cases pose diagnostic challenges.

Purpose of the Study:

  • To delineate the diagnostic challenges and management strategies for unbalanced atrioventricular canal defects.
  • To highlight the role of various imaging modalities in assessing ventricular size and function.
  • To outline the pathway for surgical palliation and long-term management in single ventricle physiology.

Main Methods:

  • Review of diagnostic modalities including echocardiography, angiographic ventriculography, and magnetic resonance imaging (MRI).

Related Experiment Videos

  • Assessment of ventricular size and function to determine suitability for biventricular repair versus single ventricle palliation.
  • Evaluation of outcomes following early intervention (pulmonary artery banding) and staged palliation (bidirectional Glenn, Fontan completion).

    • Main Results:

    • Unbalanced AV canal requires careful assessment to differentiate between biventricular repair and single ventricle palliation.
    • MRI is emerging as a valuable tool for ventricular volume assessment in complex cases.
    • Early surgical intervention and staged palliation demonstrate good outcomes, particularly with left ventricular dominance and absence of pulmonary hypertension.

    Conclusions:

    • Accurate assessment of ventricular balance is critical in atrioventricular canal defects.
    • Timely surgical palliation, including pulmonary artery banding and staged Fontan procedures, improves outcomes.
    • Favorable long-term results depend on ventricular dominance and pulmonary vascular health.