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Related Experiment Videos

Human airway narrowing measured using high resolution computed tomography

M Okazawa1, N Müller, A E McNamara

  • 1Respiratory Health Network of Center of Excellence, University of British Columbia Pulmonary Research Laboratory, Vancouver, Canada.

American Journal of Respiratory and Critical Care Medicine
|November 1, 1996
PubMed
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Asthma patients exhibit thickened smaller airways. Unlike healthy individuals, their airway walls do not change size after bronchoconstriction, potentially explaining exaggerated airway narrowing in asthma.

Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Medical Imaging

Background:

  • Asthma is characterized by exaggerated airway narrowing in response to stimuli.
  • The precise location of airway narrowing in asthma versus healthy individuals is not well understood.
  • Histological studies suggest increased airway wall thickness contributes to airway hyperresponsiveness in asthma.

Purpose of the Study:

  • To investigate differences in airway wall thickness and the site/magnitude of airway narrowing between asthmatic and normal subjects.
  • To assess the impact of bronchoconstriction on airway dimensions in asthma using high-resolution computed tomography (HRCT).

Main Methods:

  • Recruited normal subjects and patients with mild to moderate asthma.
  • Administered inhaled methacholine to induce bronchoconstriction.

Related Experiment Videos

  • Utilized high-resolution computed tomography (HRCT) to measure airway wall thickness and airway narrowing.
  • Compared measurements after a standardized decrease in forced expiratory volume in 1 second (FEV1).

    • Main Results:

    • No significant differences were found in the site or magnitude of airway narrowing between asthmatic and normal subjects for any airway size after comparable FEV1 decrease.
    • Smaller airways in asthmatic subjects were found to be significantly thickened.
    • Airway wall area did not change in asthmatic subjects post-bronchoconstriction, but decreased in normal subjects.

    Conclusions:

    • Airway wall thickening in smaller airways is a key feature in asthma.
    • The lack of change in airway wall dimensions following bronchoconstriction in asthmatics, unlike in normal subjects, may contribute to their exaggerated airway narrowing.
    • HRCT provides valuable insights into airway structural changes in asthma.