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Related Experiment Videos

Circulatory failure during severe hyperthermia in dog.

K Miki, T Morimoto, H Nose

    The Japanese Journal of Physiology
    |January 1, 1983
    PubMed
    Summary

    Acute hyperthermia initially increases cardiac output but severe heat causes circulatory collapse. Heat-induced vasodilation lowers central venous pressure, leading to decreased cardiac output and arterial pressure.

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    Medical physics·2009

    Area of Science:

    • Cardiovascular Physiology
    • Thermoregulation
    • Environmental Physiology

    Background:

    • Hyperthermia, or elevated body temperature, significantly impacts physiological functions.
    • Understanding circulatory responses to heat stress is crucial for predicting heat-related illness.

    Purpose of the Study:

    • To investigate the effects of acute hyperthermia on circulatory function in dogs.
    • To elucidate the mechanisms underlying circulatory changes during heat stress.

    Main Methods:

    • Mongrel dogs (n=6) were subjected to controlled hyperthermia.
    • Hemodynamic parameters including central venous pressure, stroke volume, cardiac output, and systemic vascular resistance were monitored.

    Main Results:

    • At 40°C core temperature, cardiac output increased and systemic vascular resistance decreased, with a 40% reduction in vascular compliance.
    • Severe hyperthermia (41-42°C) led to a sharp drop in arterial pressure, central venous pressure, and stroke volume, despite an increased heart rate.

    Conclusions:

    • Decreased central venous pressure, attributed to heat-induced vasodilation and increased unstressed vascular volume, is the primary cause of reduced cardiac output in severe hyperthermia.
    • Reduced systemic vascular compliance plays a role in maintaining central venous pressure during hyperthermia.

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