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Related Experiment Videos

Restricted posterior leaflet motion after mitral ring annuloplasty.

G R Green1, P Dagum, J R Glasson

  • 1Department of Cardiovascular and Thoracic Surgery, Stanford University School of Medicine, California 94305-5247, USA.

The Annals of Thoracic Surgery
|January 5, 2000
PubMed
Summary

Ring annuloplasty significantly restricts posterior mitral leaflet motion, altering valve closure dynamics. This study examined how Duran and Physio rings impact leaflet movement during closure in sheep.

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Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Cardiac Mechanics

Background:

  • The impact of annuloplasty rings on mitral valve leaflet dynamics is not fully understood.
  • Investigating the three-dimensional motion of the mitral valve in vivo is crucial.

Purpose of the Study:

  • To determine how flexible Duran and semirigid Carpentier-Edwards Physio annuloplasty rings affect mitral leaflet motion during valve closure.

Main Methods:

  • Radiopaque markers were implanted on mitral leaflets, annulus, and left ventricle in sheep.
  • Three groups were studied: control, Duran ring, and Physio ring.
  • Three-dimensional marker coordinates were analyzed from biplane videofluoroscopic images.

Main Results:

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  • Both annuloplasty rings immobilized the posterior leaflet's middle scallop.
  • Anterior leaflet edge excursion remained unchanged across groups.
  • Posterior leaflet edge excursion was significantly restricted by both the Duran and Physio rings.

    • Conclusions:

    • Mitral annuloplasty with either ring type substantially reduced posterior leaflet mobility.
    • Valve closure primarily involved the anterior leaflet, with the posterior leaflet acting as a buttress.