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Related Experiment Videos

Venous return as stimulus for respiration in rabbit.

A R Casacó-Parada, A Huszczuk, M Pokorski

    Acta Physiologica Polonica
    |January 1, 1982
    PubMed
    Summary

    Changes in cardiac output trigger breathing adjustments (ventilation) via lung mechanoreceptors, not carotid bodies. Vagotomy significantly reduces this response, highlighting venous return

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    Area of Science:

    • Cardiopulmonary Physiology
    • Respiratory Control
    • Exercise Physiology

    Background:

    • Exercise leads to increased ventilation (exercise hyperpnoea).
    • The precise mechanisms triggering this response are debated.
    • Potential roles of cardiac output changes and chemoreceptors are unclear.

    Purpose of the Study:

    • To investigate the role of cardiac output changes in exercise hyperpnoea.
    • To determine the involvement of carotid body chemoreceptors.
    • To elucidate the contribution of pulmonary mechanoreceptors and vagal afferents.

    Main Methods:

    • Studied anaesthetized rabbits (n=44).
    • Manipulated cardiac output via hindlimb tilting, dextran injection, and blood gas adjustments.
    • Assessed minute ventilation (VE) and end-tidal CO2.
    • Performed vagotomy and oxygen breathing challenges.

    Main Results:

    • Increased cardiac output consistently elevated VE, irrespective of CO2 flux.
    • Decreased cardiac output reduced VE.
    • Carotid body chemoreceptor denervation did not abolish the VE response.
    • Vagotomy reduced the VE response by approximately 50%.

    Conclusions:

    • Cardiac output-induced ventilation changes are mediated by pulmonary mechanoreceptors.
    • Carotid body chemoreceptors are not essential for these responses.
    • Vagal nerve integrity is crucial for approximately 50% of the VE response.
    • Increased venous return likely contributes to exercise hyperpnoea.

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