Interrelationships among airway CO2, airway pressure, and breathing frequency

J. O. Nilsestuen, R. L. Coon, E. J. Zuperku, J. P. Kampine

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The breathing frequency response to changes in airway CO2 of a vascularly isolated lobe of the canine lung has previously been shown to be primarily dependent on CO2-mediated changes in airway pressure. This study was carried out to determine what contribution changes in airway pressure make in the whole lung airway CO2-mediated breathing frequency response. Mongrel dogs were anesthetized and placed on cardiopulmonary bypass. Diaphragm electromyogram (EMG) was used to monitor respiratory center output and to trigger ventilation of the lungs. Isoproterenol administered to the lungs prevented hypocapnic airway constriction but only partially blocked the decrease in breathing frequency, suggesting that in the whole lung preparation, airway CO2 in part alters breathing frequency through a direct effect on pulmonary receptors. At constant positive end-expired pressures (1-6 Torr), 0% airway CO2 produced greater increases in expiratory time than 10% CO2. Thus airway CO2 can affect breathing frequency in the absence of CO2-related changes in airway pressure at pressures that would produce lung volumes similar to those observed at end expiration in the intact animal. An argument is presented that the receptors directly affected by CO2 are probably not located in the airways constricted by hypocapnia.

    Original languageEnglish (US)
    Pages (from-to)190-197
    Number of pages8
    JournalJournal of Applied Physiology Respiratory Environmental and Exercise Physiology
    Volume52
    Issue number1
    StatePublished - 1982

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    Respiration
    Pressure
    Lung
    Respiratory Center
    Hypocapnia
    Electromyography
    Diaphragm
    Cardiopulmonary Bypass
    Isoproterenol
    Constriction
    Ventilation
    Canidae
    Dogs

    ASJC Scopus subject areas

    • Endocrinology
    • Physiology

    Cite this

    Interrelationships among airway CO2, airway pressure, and breathing frequency. / Nilsestuen, J. O.; Coon, R. L.; Zuperku, E. J.; Kampine, J. P.

    In: Journal of Applied Physiology Respiratory Environmental and Exercise Physiology, Vol. 52, No. 1, 1982, p. 190-197.

    Research output: Contribution to journalArticle

    Nilsestuen, J. O. ; Coon, R. L. ; Zuperku, E. J. ; Kampine, J. P. / Interrelationships among airway CO2, airway pressure, and breathing frequency. In: Journal of Applied Physiology Respiratory Environmental and Exercise Physiology. 1982 ; Vol. 52, No. 1. pp. 190-197.
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