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Related Experiment Videos

Cardiac function in patients with prior myocarditis

S K Das, T J Brady, J H Thrall

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |July 1, 1980
    PubMed
    Summary

    Prior myocarditis can cause hidden left-ventricular dysfunction. Asymptomatic patients showed reduced left-ventricular ejection fraction during exercise, indicating potential long-term cardiac issues.

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    Area of Science:

    • Cardiology
    • Nuclear Cardiology
    • Cardiac Imaging

    Background:

    • Myocarditis, an inflammation of the heart muscle, can lead to long-term cardiac sequelae.
    • Assessing left-ventricular (LV) function reserve is crucial for identifying subclinical cardiac dysfunction.
    • Prior myocarditis patients may have impaired LV function despite appearing asymptomatic.

    Purpose of the Study:

    • To evaluate left-ventricular functional reserve in asymptomatic patients with a history of myocarditis.
    • To compare exercise-induced changes in left-ventricular ejection fraction (LVEF) between prior myocarditis patients and healthy controls.
    • To determine if conventional resting cardiac indices can detect subclinical left-ventricular dysfunction post-myocarditis.

    Main Methods:

    • Gated cardiac blood-pool imaging was performed at rest and during exercise.
    • Left-ventricular ejection fraction (LVEF) was measured in six asymptomatic patients with prior myocarditis and six age-matched controls.
    • Coronary artery disease was excluded using coronary arteriography or clinical assessment.

    Main Results:

    • Resting LVEF was normal in most prior myocarditis patients, similar to controls (0.58 +/- 0.05 vs. 0.65 +/- 0.02).
    • Three patients with prior myocarditis had resting LVEF < 0.50.
    • During exercise, prior myocarditis patients showed an 8% decrease in mean LVEF, while controls increased LVEF by 15% (p < 0.01).

    Conclusions:

    • Asymptomatic patients with prior myocarditis exhibit subclinical left-ventricular dysfunction.
    • Exercise stress testing reveals impaired left-ventricular functional reserve not apparent at rest.
    • Long-term follow-up is recommended for individuals with a history of myocarditis to monitor cardiac health.

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