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Changes in left atrioventricular valve geometry after surgical repair of complete atrioventricular canal

Elisabeth Kaza1, Gerald R Marx, Aditya K Kaza

  • 1Division of Cardiac Surgery and Cardiology, Children's Hospital Boston and Harvard Medical School, Boston, MA, USA.

The Journal of Thoracic and Cardiovascular Surgery
|November 15, 2011
PubMed

Insights

Complete atrioventricular canal repair alters left atrioventricular valve geometry, causing annular shape changes and increased area. These geometric changes may explain the progression of left atrioventricular valve regurgitation after repair.

Area of Science:

  • Cardiovascular Surgery
  • Pediatric Cardiology
  • Echocardiography

Background:

  • Late surgical reintervention after complete atrioventricular canal (CAVC) repair is often due to left atrioventricular valve (LAVV) regurgitation.
  • Understanding LAVV geometry changes post-repair is crucial for predicting and preventing regurgitation.

Purpose of the Study:

  • To investigate the alterations in LAVV geometry following surgical repair of CAVC defects.
  • To identify geometric factors that may predispose patients to LAVV regurgitation.

Main Methods:

  • Two-dimensional echocardiography was used to measure LAVV annulus dimensions and left ventricular (LV) volumes at preoperative, early postoperative, and midterm postoperative (6-12 months) time points.
  • Measurements included LAVV annulus area, LV volume, and vena contracta of the regurgitant jet, all normalized to body surface area.

Main Results:

  • Following CAVC repair, the LAVV annulus remodeled from an elliptical to a more circular shape.
  • Significant increases in LAVV annulus area were observed in both systole and diastole postoperatively, which were sustained at midterm follow-up.
  • Left ventricular volumes also increased significantly in the early and midterm postoperative periods compared to preoperative measurements.

Conclusions:

  • Surgical repair of CAVC defects induces significant changes in LAVV annular geometry, characterized by increased area and a shift towards a circular shape.
  • The observed annular remodeling, particularly the increased circumference of the posterior free wall, may represent a mechanism driving progressive central regurgitation.
  • These geometric insights could inform strategies to mitigate or prevent post-repair LAVV regurgitation.
Abstract

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