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[Bronchial asthma].

Y Kikuchi1, S Okabe, J Midorikawa

  • 1First Department of Internal Medicine, Tohoku University School of Medicine.

Nihon Kyobu Shikkan Gakkai Zasshi
|December 1, 1992
PubMed
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Increased vagal afferent activity may worsen asthma by enhancing CO2 response. Reduced hypoxic ventilatory response in severe asthma might link to fatal outcomes.

Area of Science:

  • Respiratory Physiology
  • Pulmonary Medicine
  • Neuroscience

Background:

  • Asthma exacerbations involve complex respiratory changes.
  • Vagal afferent activity and chemosensitivity are implicated in asthma pathophysiology.
  • Understanding these mechanisms is crucial for managing severe asthma and preventing mortality.

Purpose of the Study:

  • To investigate the role of vagal afferent activity in the increased ventilatory response to carbon dioxide (CO2) in asthma.
  • To examine the hypoxic ventilatory response in patients with near-fatal asthma.

Main Methods:

  • Prostaglandin E2 (PGE2) inhalation was used to stimulate vagal afferents in normal subjects.
  • Respiratory responses to CO2 and hypoxia were measured in normal subjects, patients with uncomplicated asthma, and patients with near-fatal asthma.

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Main Results:

  • PGE2 inhalation significantly increased ventilatory and occlusion pressure responses to CO2 in normal subjects without increasing respiratory resistance.
  • Hypoxic ventilatory response was significantly lower in patients with near-fatal asthma compared to controls.

Conclusions:

  • Increased vagal afferent activity may contribute to the heightened hypercapnic response during asthma exacerbations.
  • Reduced hypoxic ventilatory response may be a risk factor for asthma-related deaths.