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Subaortic obstruction and the Fontan operation

R M Freedom1

  • 1Department of Pediatrics, The Hospital for Sick Children, University of Toronto Faculty of Medicine, Ontario, Canada.

The Annals of Thoracic Surgery
|September 2, 1998
PubMed
Summary
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Systemic outflow tract obstruction is a risk factor for poor outcomes in single ventricle heart patients undergoing the Fontan procedure. Surgical strategies like bidirectional cavopulmonary connection have effectively managed this obstruction.

Area of Science:

  • Cardiology
  • Pediatric Cardiology
  • Congenital Heart Disease

Background:

  • Systemic outflow tract obstruction (SOOTO) in single ventricle physiology is linked to myocardial hypertrophy and adverse outcomes after the Fontan procedure.
  • SOOTO can be congenital or acquired, with acquired forms influenced by factors like ventricular septal defect size and prior surgeries in complex congenital heart defects.

Purpose of the Study:

  • To analyze the contributing factors to acquired systemic outflow tract obstruction in patients with specific complex heart conditions.
  • To evaluate the effectiveness of surgical staging in mitigating the risks associated with SOOTO in this population.

Main Methods:

  • Review of clinical data and surgical histories of patients with double-inlet left ventricle, rudimentary right ventricle, and discordant ventriculoarterial connection.

Related Experiment Videos

  • Analysis of the impact of interventions such as bidirectional cavopulmonary connection and ventricular septal defect enlargement on SOOTO.

    • Main Results:

    • Identified ventricular septal defect size, pulmonary artery banding, and volume unloading procedures as key contributors to acquired SOOTO.
    • Demonstrated that staged surgical approaches, including bidirectional cavopulmonary connection and VSD enlargement, have successfully addressed this obstructive factor.

    Conclusions:

    • Acquired systemic outflow tract obstruction is a significant concern in complex single ventricle heart disease.
    • Staged surgical management provides an effective strategy to neutralize the negative impact of SOOTO, improving outcomes for Fontan procedure candidates.