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Related Experiment Videos

Effects of standard mitral valve replacement on left ventricular function.

D H Harpole1, J S Rankin, W G Wolfe

  • 1Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710.

The Annals of Thoracic Surgery
|June 1, 1990
PubMed
Summary

Excision of the mitral valve apparatus during mitral valve replacement may not impair left ventricular performance. This study found no significant changes in stroke work/end-diastolic volume relationship after valve replacement surgery.

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Area of Science:

  • Cardiovascular Surgery
  • Cardiac Physiology
  • Biomedical Engineering

Background:

  • Mitral valve replacement (MVR) surgery involves mitral valve apparatus excision.
  • Concerns exist regarding potential impairment of left ventricular (LV) performance post-MVR.
  • Load-independent functional measurements in humans are challenging.

Purpose of the Study:

  • To investigate the impact of mitral valve apparatus excision on LV performance post-MVR.
  • To obtain load-independent functional measurements in patients undergoing MVR.

Main Methods:

  • 12 patients with mitral regurgitation or stenosis underwent prosthetic valve replacement.
  • LV volume, pressure, and wall volume were measured using radionuclide angiocardiography, micromanometry, and echocardiography.

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  • LV preload was manipulated to generate pressure-volume loops, and LV performance was assessed using the stroke work/end-diastolic volume relationship.

    • Main Results:

    • No significant change in LV wall volume was observed post-cardiopulmonary bypass for either mitral regurgitation or stenosis groups.
    • The stroke work/end-diastolic volume relationship, a load-insensitive measure, showed no significant alteration post-MVR.

    Conclusions:

    • Excision of the mitral valve apparatus during MVR does not appear to significantly impair LV performance.
    • The study provides evidence supporting the preservation of LV function despite mitral valve apparatus removal.