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Elevated diaphragm electromyogram during neonatal hypoxic ventilatory depression.

W A LaFramboise, D E Woodrum

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |October 1, 1985
    PubMed
    Summary
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    Newborn monkeys show an initial increase in ventilation during hypoxia, followed by a decrease. This biphasic response is not solely due to reduced neural drive to the diaphragm, suggesting other factors like respiratory mechanics may be involved.

    Area of Science:

    • Neonatal physiology
    • Respiratory control

    Background:

    • The ventilatory response to hypoxia in newborns is complex and biphasic.
    • Understanding the neural and mechanical factors influencing this response is crucial for neonatal respiratory health.

    Purpose of the Study:

    • To investigate the role of diaphragmatic neural activity in the biphasic ventilatory response to hypoxia in newborn monkeys.
    • To determine if hypoxic-induced depression of neural input to the diaphragm contributes to the decline in ventilation.

    Main Methods:

    • Diaphragmatic electromyogram (EMG) was recorded in unanesthetized 48-hour-old monkeys.
    • Animals breathed air, followed by hypoxic gas mixtures (12% or 8% O2) for 5 minutes.
    • Minute ventilation (VI), tidal volume (VT), and diaphragmatic neural activity (EMG/min) were analyzed.

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    Main Results:

    • Minute ventilation initially increased with hypoxia, driven by tidal volume and diaphragmatic neural activity.
    • Ventilation subsequently decreased by 5 minutes of hypoxia, primarily due to a fall in tidal volume.
    • Despite declining ventilation, diaphragmatic neural activity remained elevated, suggesting factors beyond neural depression.

    Conclusions:

    • Hypoxic-induced depression of neural input to the diaphragm is not the sole cause of the biphasic ventilatory response in newborns.
    • The observed fall in ventilation despite elevated EMG suggests alterations in respiratory mechanics or diaphragmatic contractile function.