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Related Experiment Videos

Canine hyperthermia with cerebral protection

R W Carithers, R C Seagrave

    Journal of Applied Physiology
    |April 1, 1976
    PubMed
    Summary

    Whole-body hyperthermia in dogs was safely achieved using warm water baths. Nasal irrigation allowed higher temperatures, demonstrating a novel method for extreme body heating without adverse effects.

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    Area of Science:

    • Physiology
    • Thermoregulation
    • Animal Models

    Background:

    • Whole-body hyperthermia is a therapeutic modality with potential applications.
    • Achieving and maintaining elevated body temperatures safely presents significant challenges.
    • Understanding thermoregulatory mechanisms is crucial for controlled hyperthermia protocols.

    Purpose of the Study:

    • To investigate the feasibility of inducing extreme whole-body hyperthermia in canines.
    • To evaluate the safety and efficacy of a novel nasal irrigation technique for enhancing hyperthermia.
    • To develop a mathematical model for predicting temperature responses during hyperthermia.

    Main Methods:

    • Utilized warm water baths to elevate canine body core temperature.
    • Implemented cold water irrigation of the nasal alar fold as an experimental variable.
    • Monitored core and brain temperatures, establishing brain-core temperature differentials.
    • Developed and solved a differential equation to model heat transfer dynamics.

    Main Results:

    • Achieved extreme whole-body hyperthermia (up to 43°C) without lasting side effects in canines.
    • Nasal irrigation enabled a 0.5-1.0°C higher core temperature elevation compared to non-irrigated controls.
    • The physiological arteriovenous heat exchanger at the brain base maintained temperature differentials.
    • A mathematical model accurately described dynamic temperature responses and predicted experimental parameters.

    Conclusions:

    • Extreme whole-body hyperthermia is achievable and tolerable in canines using warm water baths and nasal irrigation.
    • Nasal irrigation is an effective method to augment core temperature during hyperthermia protocols.
    • The developed mathematical model provides a valuable tool for understanding and predicting hyperthermia dynamics.

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