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Related Experiment Videos

[Bronchoconstriction in isocapnic hyperventilation-induced asthma].

A Ohtsuka1, S Koyama, T Yashizawa

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

Nihon Kyobu Shikkan Gakkai Zasshi
|October 1, 1990
PubMed
Summary

Exercise and isocapnic hyperventilation trigger similar bronchoconstriction in asthma patients. While both challenges activate neutrophil chemotactic factor (NCF), hyperventilation-induced asthma (HIA) may involve different mechanisms than exercise-induced asthma (EIA).

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Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Clinical Immunology

Context:

  • Asthma patients can experience bronchoconstriction following exercise (exercise-induced asthma, EIA).
  • Isocapnic hyperventilation (HV) is also known to induce similar bronchoconstriction (hyperventilation-induced asthma, HIA) in asthmatic individuals.
  • The precise mechanisms underlying HIA remain unclear.

Purpose:

  • To investigate and compare the effects of exercise and isocapnic hyperventilation challenges on pulmonary function and neutrophil chemotactic factor (NCF) levels in asthmatic patients.
  • To determine if HIA shares similar pathophysiological pathways with EIA.

Summary:

  • Twelve asthmatic patients underwent both exercise and isocapnic hyperventilation challenges.
  • Pulmonary function tests (FEV1.0, Rrs, V50, V25) and peripheral blood NCF levels were measured before and after each challenge.

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  • Results showed comparable airway obstruction after both challenges, with patients developing EIA also developing HIA.
  • NCF levels increased significantly after both challenges in patients experiencing bronchoconstriction, though the increase was less pronounced after HV.

    • Impact:

    • The study suggests that while both exercise and isocapnic hyperventilation can induce similar bronchoconstriction in asthmatic patients, the underlying mechanisms may differ.
    • The observed increase in NCF after HV indicates a potential role for chemical mediators in HIA.
    • These findings contribute to a better understanding of asthma pathophysiology and may inform future therapeutic strategies.