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Acute changes in left ventricular geometry after volume reduction operation

J Rychik1, M L Jacobs, W I Norwood

  • 1Department of Pediatrics, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine 19104, USA.

The Annals of Thoracic Surgery
|November 1, 1995
PubMed
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The Fontan operation significantly alters heart geometry, increasing wall thickness and decreasing cavity size more than hemi-Fontan or VSD closure. These changes in ventricular geometry may impact cardiac function after surgery.

Area of Science:

  • Cardiovascular Surgery
  • Pediatric Cardiology
  • Cardiac Physiology

Background:

  • Surgical correction of congenital heart defects can alter myocardial mass and ventricular dimensions.
  • Post-operative changes in ventricular geometry may affect cardiac performance.
  • Understanding acute geometric changes is crucial for predicting clinical outcomes.

Purpose of the Study:

  • To investigate acute changes in ventricular geometry after Fontan and hemi-Fontan operations for tricuspid atresia.
  • To compare these changes with ventricular septal defect closure in a two-ventricle heart.
  • To correlate geometric alterations with clinical outcomes.

Main Methods:

  • Echocardiography before and after surgery (Fontan, hemi-Fontan, VSD closure).

Related Experiment Videos

  • Measurement of left ventricular wall thickness and cavity dimensions (end-diastole).
  • Calculation of posterior wall thickness to cavity diameter ratio.

    • Main Results:

    • All groups showed increased wall thickness post-surgery.
    • The Fontan operation resulted in the most significant increase in wall thickness.
    • Cavity dimensions decreased most dramatically after the Fontan operation compared to hemi-Fontan or VSD closure.
    • Posterior wall thickness to cavity diameter ratios increased in all groups, being highest after the Fontan operation.

    Conclusions:

    • The Fontan operation induces the most pronounced changes in ventricular geometry (increased wall thickness, decreased cavity size).
    • Hemi-Fontan operation leads to milder geometric alterations.
    • These geometric changes may partly explain the favorable clinical course observed after the hemi-Fontan operation.