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Small airway inflammation and asthma.

P Howarth1

  • 1Southampton General Hospital, UK.

International Journal of Clinical Practice. Supplement
|May 27, 1999
PubMed
Summary

Asthma affects both large and small airways, causing inflammation and structural changes. Effective treatment requires targeting inflammation throughout the entire airway system for maximal suppression.

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Area of Science:

  • Pulmonary Medicine
  • Respiratory System Research
  • Asthma Pathophysiology

Background:

  • Asthma is characterized by inflammation and structural changes in the large airways.
  • Evidence suggests these changes also occur in the small airways of asthmatic patients.
  • Understanding airway-wide changes is crucial for effective asthma management.

Purpose of the Study:

  • To review evidence of inflammatory and structural changes throughout the airways in asthma.
  • To discuss the relevance of these airway-wide changes.
  • To highlight the need for comprehensive anti-inflammatory treatment strategies.

Main Methods:

  • Review of existing evidence from large and small airway studies.
  • Analysis of transbronchial biopsies and bronchoalveolar lavage.
  • Examination of resected or post-mortem lung tissue from asthmatic subjects.

Main Results:

  • Inflammatory and structural changes, including fibroblast proliferation and collagen deposition, are present in both large and small airways.
  • Increased numbers of activated eosinophils are found in the small airways compared to large airways.
  • Eosinophilic inflammation in alveolar walls correlates with nocturnal asthma symptoms.

Conclusions:

  • Asthma involves inflammation and structural alterations across the entire airway tree.
  • Targeting inflammation in both large and small airways is essential.
  • Comprehensive anti-inflammatory therapies are needed for maximal symptom control in asthma.

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