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Related Experiment Videos

Left ventricular function in patients with mitral valve prolapse. A radionuclide evaluation

M Ahmad, H Haibach

    Clinical Nuclear Medicine
    |December 1, 1982
    PubMed
    Summary

    Abnormal left ventricular function during exercise in mitral valve prolapse (MVP) patients may not always signal coronary artery disease. Isolated MVP can also cause exercise-induced left ventricular dysfunction.

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    Area of Science:

    • Cardiology
    • Cardiovascular Imaging
    • Nuclear Cardiology

    Background:

    • Mitral valve prolapse (MVP) is a common valvular heart condition.
    • Assessing left ventricular (LV) function during exercise is crucial for diagnosing cardiac pathologies.
    • The role of exercise in unmasking LV dysfunction in isolated MVP requires further elucidation.

    Purpose of the Study:

    • To investigate the exercise-induced changes in left ventricular ejection fraction (LVEF) in patients with mitral valve prolapse (MVP).
    • To differentiate the LV functional response to exercise between patients with isolated MVP and those with MVP and coronary artery disease (CAD).

    Main Methods:

    • Radionuclide angiography was performed at rest and during exercise in 30 patients with confirmed MVP.
    • Patients were categorized into two groups: isolated MVP (12 patients) and MVP with associated coronary artery disease (18 patients).

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  • Resting and exercise LVEF and wall motion were assessed.

    • Main Results:

    • All patients exhibited normal resting LV function.
    • In patients with MVP and CAD, LVEF remained unchanged in 15, decreased in 2, and increased in 1 during exercise.
    • In patients with isolated MVP, LVEF increased in 6, remained unchanged in 4, and decreased in 2 during exercise.

    Conclusions:

    • An abnormal LV functional response during exercise does not exclusively indicate coronary artery disease and can be observed in isolated MVP.
    • Exercise-induced left ventricular dysfunction may be a subtle manifestation of isolated MVP, detectable only under stress conditions.