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Respiratory frequency control during external elastic loading and chest compression.

R Shannon

    Respiration Physiology
    |January 1, 1975
    PubMed
    Summary
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    Extravagal respiratory mechanoreceptors do not influence respiratory frequency during elastic loading in cats and dogs. However, chest compression in dogs triggers a neural reflex that increases respiratory frequency via chest wall mechanoreceptors.

    Area of Science:

    • Physiology
    • Respiratory Control
    • Neuroscience

    Background:

    • The control of breathing involves complex neural pathways.
    • The role of non-pulmonary stretch receptors, specifically chest wall mechanoreceptors, in respiratory frequency regulation remains incompletely understood.

    Purpose of the Study:

    • To investigate the involvement of extravagal (chest wall) respiratory mechanoreceptors in controlling respiratory frequency during external elastic loading (EEL) and chest compression (CC).

    Main Methods:

    • Experiments were performed on anesthetized, vagotomized cats and dogs.
    • Respiratory frequency responses to CO2 rebreathing were compared with responses during EEL and CC.
    • Frequency versus PaCO2 curves were analyzed to assess mechanoreceptor influence.

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    Main Results:

    • No significant difference was observed between CO2 and EEL curves in cats and dogs, indicating no extravagal mechanoreceptor contribution to respiratory frequency control during EEL.
    • Dogs exhibited an increase in respiratory frequency during chest compression, suggesting an extravagal neural reflex mediated by chest wall mechanoreceptors.

    Conclusions:

    • Extravagal mechanoreceptors do not play a role in respiratory frequency control during steady-state external elastic loading.
    • Chest wall mechanoreceptors in dogs mediate a neural reflex that increases respiratory frequency in response to chest compression.