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Ventricular function before and after mitral valve replacement

M Kirschbaum, F Lumia, P Germon

    The Journal of Thoracic and Cardiovascular Surgery
    |November 1, 1981
    PubMed
    Summary
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    Mitral valve replacement significantly improves right ventricular function, which is sustained long-term, though some prosthetic valve types show decline. Left ventricular function remains stable post-operation.

    Area of Science:

    • Cardiovascular Surgery
    • Cardiac Physiology
    • Biomedical Engineering

    Background:

    • Right ventricular (RV) function is crucial after mitral valve replacement (MVR).
    • Preoperative RV dysfunction can impact outcomes in patients with mitral valve disease.

    Purpose of the Study:

    • To evaluate the impact of MVR on RV function.
    • To assess the long-term durability of RV function improvement after MVR.
    • To investigate the influence of prosthetic valve type on RV function.

    Main Methods:

    • First-pass radionuclide angiography used in 84 patients with isolated mitral valve disease.
    • Evaluations performed preoperatively, 1 week, 3 months, and 1 year post-MVR.
    • Analysis included grouping by prosthetic valve type (bioprosthesis vs. disc valve).

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    Main Results:

    • RV ejection fraction (RVEF) improved significantly from 29% to 43% at 1 week post-MVR (p < 0.001).
    • RVEF improvement was maintained up to 1 year post-MVR.
    • RVEF declined in patients with Carpentier bioprostheses, particularly larger ones, while remaining stable with disc valves.

    Conclusions:

    • Mitral valve replacement leads to significant and sustained improvement in RV function.
    • Prosthetic valve type influences long-term RV function post-MVR, with disc valves showing better durability.
    • Left ventricular function remains unchanged following MVR.