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Related Experiment Videos

Nasobronchial relationship after cold air provocation.

A Johansson1, M Bende, E Millqvist

  • 1Department of Lung Medicine and Allergology, Sahlgrenska University Hospital, Gothenburg, Sweden.

Respiratory Medicine
|December 29, 2000
PubMed
Summary
This summary is machine-generated.

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Cold air in the nose affects asthma lung function, suggesting a nasobronchial link. However, this study found no evidence of a nasobronchial reflex, as blocking nasal nerves or using anticholinergics did not prevent the lung function changes.

Area of Science:

  • Respiratory Medicine
  • Pulmonary Physiology

Background:

  • Asthma patients exhibit altered lung function in response to nasal cold air provocation, unlike healthy individuals.
  • Previous observations suggested a potential nasobronchial reflex pathway mediating these responses.

Purpose of the Study:

  • To investigate the mechanisms underlying the nasobronchial response to cold air stimulation.
  • To determine if a nasobronchial reflex could be blocked by nasal anesthesia or anticholinergic agents.

Main Methods:

  • Lung function was assessed using specific airway conductance and forced expiratory flow.
  • Nasal provocation with cold air was performed before and after nasal anesthesia.
  • Anticholinergic medication was administered prior to cold air provocation.

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Main Results:

  • Cold air stimulation of the nose led to reduced lung function (broncho-obstruction) in asthma patients.
  • Nasal anesthesia failed to block the observed changes in lung function.
  • Inhaling an anticholinergic drug did not prevent the lung function impairment after cold stimulation.

Conclusions:

  • The study confirms a relationship between nasal stimulation and bronchial function in asthma.
  • The findings do not support the existence of a vagally mediated nasobronchial reflex.
  • Alternative mechanisms may be responsible for the observed nasobronchial link in asthma.