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Related Experiment Videos

[Respiratory work in panting in swine].

M G Clement, V Russo, C Sacchi

    Bollettino Della Societa Italiana Di Biologia Sperimentale
    |October 15, 1979
    PubMed
    Summary

    The work of breathing (Wdyn) increases with ventilation in pigs. However, elevated body temperatures above 39°C decrease Wdyn, suggesting airway changes during thermal tachypnea.

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    Area of Science:

    • Physiology
    • Respiratory Mechanics
    • Animal Models

    Context:

    • The work of breathing (Wdyn) is a critical physiological parameter.
    • Understanding Wdyn during altered physiological states like fever is essential.
    • Previous studies have not fully elucidated Wdyn changes during thermal tachypnea.

    Purpose:

    • To measure the dynamic work of breathing (Wdyn) in anesthetized, tracheotomized pigs during induced thermal tachypnea.
    • To investigate the relationship between ventilation and Wdyn under euthermic and hyperthermic conditions.
    • To explore potential changes in respiratory tract dimensions.

    Summary:

    • Wdyn was measured in pigs undergoing thermal tachypnea.
    • Under euthermia, Wdyn increased with ventilation (V) following the equation Wdyn = 1.09V² + 1.33V³.
    • Hyperthermia (body temperature > 39°C) resulted in a decrease in Wdyn for a given ventilation.
    • Observed changes in airway size and potentially Weibel's respiratory tract structures were noted.

    Impact:

    • Provides quantitative data on the impact of fever on respiratory effort.
    • Suggests that hyperthermia influences respiratory mechanics, possibly through airway alterations.
    • Highlights the utility of the pig model for respiratory research.

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