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Related Experiment Videos

Exercise testing in mitral valve prolapse before and after beta blockade

E G Abinader, J Shahar

    British Heart Journal
    |August 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Exercise electrocardiograms can show false positives due to mitral valve prolapse. Beta blockade normalizes these exercise test results, improving accuracy for diagnosing coronary artery disease.

    Area of Science:

    • Cardiology
    • Exercise Physiology

    Background:

    • Exercise electrocardiograms (ECG) are crucial for diagnosing coronary artery disease (CAD).
    • However, positive exercise ECG results are not always indicative of CAD.
    • Mitral valve prolapse (MVP) can clinically and electrocardiographically mimic CAD during exercise testing.

    Purpose of the Study:

    • To investigate the effect of beta blockade on exercise ECGs in patients with MVP.
    • To determine if beta blockade can help differentiate MVP from true CAD on exercise tests.

    Main Methods:

    • Twelve patients with MVP and positive exercise ECGs were enrolled.
    • Repeat exercise testing was performed after administration of beta blockers.
    • Adequate beta blockade was confirmed by a 17-22% reduction in heart rate.

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    Main Results:

    • All exercise ECG tracings normalized after beta blockade.
    • This normalization suggests that MVP can cause false positive exercise ECGs.
    • The study reports the first such findings in English literature.

    Conclusions:

    • Beta blockade can eliminate false positive exercise ECG responses in patients with MVP.
    • Incorporating post-beta blockade exercise testing may improve the specificity of exercise tests.
    • Similar exercise ECG responses after beta blockade should raise suspicion for MVP.