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Related Experiment Videos

Peripheral neural modulation of endotoxin-induced hyperventilation

G J Tang1, Y R Kou, Y S Lin

  • 1Department of Anesthesiology and Surgical Critical Care, School of Medicine and Life Science, National Yang-Ming University, Taipei, Taiwan, Republic of China.

Critical Care Medicine
|September 29, 1998
PubMed
Summary

Peripheral neural reflexes modulate hyperventilation during endotoxemia. Vagal C-fiber afferents increase respiratory rate, while peripheral chemoreceptors restrain it, potentially offering protection.

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Area of Science:

  • Physiology
  • Neuroscience
  • Immunology

Background:

  • Endotoxemia, a condition caused by bacterial endotoxins, can lead to significant physiological changes, including altered respiratory patterns.
  • Hyperventilation is a common response to endotoxemia, but the underlying neural mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the specific roles of peripheral neural reflexes in modulating hyperventilation during endotoxemia.
  • To determine the contribution of vagal C-fiber afferents and peripheral chemoreceptors to the respiratory response to endotoxin.

Main Methods:

  • A prospective, randomized, controlled study was conducted in adult Sprague-Dawley rats.
  • Rats underwent interventions including sham operations, bilateral vagotomy, perivagal capsaicin treatment, or peripheral chemoreceptor denervation before endotoxin challenge.

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  • Respiration was monitored for 5 hours post-endotoxin administration to assess respiratory rate and tidal volume.

    • Main Results:

    • Endotoxin challenge significantly increased respiratory rate and tidal volume in control rats.
    • Bilateral vagotomy and capsaicin treatment abolished the endotoxin-induced tachypnea.
    • Denervation of peripheral chemoreceptors exacerbated hyperventilation and reduced survival time.

    Conclusions:

    • Vagal C-fiber afferents stimulate increased respiratory rate during endotoxemia.
    • Peripheral chemoreceptors act to restrain hyperventilation, suggesting a protective role in endotoxemia.
    • These findings elucidate the complex neural control of respiration during endotoxemia.