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Mitral valve function and chordal force distribution using a flexible annulus model: an in vitro study.

Jorge Hernan Jimenez1, Dennis Dam Soerensen, Zhaoming He

  • 1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0535, USA.

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Summary

Papillary muscle displacement increases mitral regurgitation by altering chordal tension. Annular motion significantly impacts basal chord tension but not intermediate or marginal chords.

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Area of Science:

  • Cardiovascular Research
  • Biomedical Engineering
  • Heart Valve Mechanics

Background:

  • Dilated cardiomyopathy and ischemic mitral regurgitation are associated with changes in annular motion and papillary muscle position.
  • Understanding these biomechanical factors is crucial for valve function assessment.

Purpose of the Study:

  • To investigate how annular flexibility and papillary muscle displacement affect chordal force and mitral valve function.
  • To quantify the impact of these dynamic changes on mitral regurgitation.

Main Methods:

  • Utilized a left heart simulator with six human mitral valves and a flexible annular model.
  • Monitored mitral flow, trans-mitral pressure, and chordae tendineae tension under normal and pathological conditions.

Main Results:

  • A flexible annulus model significantly increased mitral regurgitation volume compared to static models.
  • Papillary muscle displacement, particularly with a flexible annulus, elevated tension on anterior strut, posterior intermediate, and commissural chords.
  • Basal chord tension was significantly affected by annular motion, unlike intermediate and marginal chords.

Conclusions:

  • Papillary muscle displacement contributes to mitral regurgitation through increased chordal tension and leaflet "tenting".
  • Annular motion primarily influences basal chord tension, highlighting its role in mitral valve dynamics.