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Lung mechanics during induced bronchoconstriction

R Pellegrino1, O Wilson, G Jenouri

  • 1Pulmonary Section, Baylor College of Medicine, Houston, Texas 77030, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1996
PubMed
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Asthma patients show a stronger peripheral response to airway constrictors compared to healthy individuals. Deep inhalation has less effect on airflow in asthmatics, suggesting distinct lung mechanics in asthma.

Area of Science:

  • Pulmonary Physiology
  • Respiratory Medicine
  • Asthma Research

Background:

  • Understanding lung mechanics differences between asthmatic and normal individuals is crucial for effective treatment.
  • Airway hyperresponsiveness is a hallmark of asthma, but its impact on specific lung mechanics parameters requires further investigation.

Purpose of the Study:

  • To compare lung mechanics, including pulmonary resistance (RL) and dynamic elastance (Edyn), in asthmatic and normal individuals during bronchial challenges.
  • To investigate the effects of deep inhalation (DI) on maximal flows, Edyn, and RL in both groups.
  • To determine if different constrictor agents elicit specific patterns of response.

Main Methods:

  • Eight asthmatic and eight normal subjects underwent bronchial challenges with methacholine, histamine, and ATP.

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  • Measurements included partial forced expiratory flows, RL, Edyn, and the effects of DI.
  • RL was partitioned into inspiratory and expiratory components.

    • Main Results:

    • Pulmonary resistance (RL) increased significantly more in normal individuals than in asthmatic individuals for a given flow decrement.
    • Deep inhalation (DI) had a smaller effect on airflow in asthmatic individuals compared to normal individuals.
    • Recovery of RL and Edyn after DI was faster in both groups, with a faster Edyn recovery.

    Conclusions:

    • Asthmatic individuals exhibit a stronger peripheral response to agonists compared to normal individuals.
    • Tidal inspiration may induce transient bronchodilation in more constricted subjects, as indicated by the inspiratory to expiratory RL ratio.
    • Differences in lung mechanics and response to DI highlight distinct airway behaviors in asthma.