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Increased left ventricular function as an adaptive response in vibration disease.

T Matoba, M Itaya, K Toyomasu

    The American Journal of Cardiology
    |April 1, 1983
    PubMed
    Summary
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    Long-term exposure to vibrating tools can cause vibration disease. This study found that patients with vibration disease exhibit adaptive cardiovascular responses, including increased ejection fraction and stroke volume index, suggesting a compensatory mechanism to stressors.

    Area of Science:

    • Occupational Health
    • Cardiovascular Physiology
    • Environmental Medicine

    Background:

    • Vibration disease is a condition caused by prolonged exposure to vibrating tools, noise, and cold.
    • These environmental stressors can negatively impact human health.
    • Understanding the physiological effects on the cardiovascular system is crucial.

    Purpose of the Study:

    • To investigate the cardiovascular adaptations in individuals with vibration disease.
    • To assess cardiac function using echocardiography and electrocardiography.
    • To explore the relationship between autonomic nerve activity and cardiac parameters.

    Main Methods:

    • Echocardiographic assessment of left ventricular ejection fraction (LVEF) and left ventricular end-diastolic dimension.

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  • Measurement of stroke volume index (SVI).
  • Electrocardiogram (ECG) analysis, including heart rate and T/R wave ratios.

    • Main Results:

    • Significantly higher LVEF (79 +/- 4%) in vibration disease patients compared to controls (75 +/- 6%) (p < 0.01).
    • Increased LVEF correlated with increased left ventricular end-diastolic dimension and autonomic nerve activity.
    • Significantly higher SVI (p < 0.001) and lower resting heart rate observed in patients.
    • ECG showed an increased T/R wave ratio in lead V6.

    Conclusions:

    • The cardiovascular system in vibration disease patients demonstrates adaptive responses to chronic stressors.
    • Increased LVEF and SVI suggest a compensatory mechanism to maintain cardiac output.
    • Findings highlight the physiological impact of occupational vibration exposure.