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Quantitative structural alterations in long-standing allergic asthma.

The American Review of Respiratory Disease

|August 1, 1984

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Long-standing asthma can cause irreversible airflow obstruction due to small airway narrowing and inflammation. Bronchial basement membrane thickening is a key indicator in severe allergic asthma.

Area of Science:

Pulmonary Medicine
Pathology
Immunology

Background:

Severe, long-standing asthma is associated with chronic airflow obstruction.
The precise structural changes leading to non-reversible obstruction in asthma are not fully understood.
Understanding these changes is crucial for managing chronic asthma patients.

Purpose of the Study:

To quantitatively characterize structural lung alterations in elderly, non-smoking individuals with severe, long-standing allergic asthma.
To identify specific histological features correlating with chronic airflow obstruction in these patients.
To investigate potential structural differences compared to control subjects.

Main Methods:

Quantitative histological analysis of lung tissue from 6 elderly asthmatic patients and 7 control subjects.

Related Experiment Videos

Assessment of bronchial smooth muscle percentage, small airway diameter, mean linear intercept (interalveolar distance), and bronchial basement membrane thickness.

Histological examination for inflammation and fibrosis.

Main Results:

Bronchial smooth muscle percentage was not significantly elevated in asthmatics.
Two asthmatics showed reduced small airway diameters with inflammation or fibrosis.
Bronchial basement membrane thickness was significantly increased in asthmatics (8.3 ± 2.0 μm) compared to controls (5.1 ± 0.9 μm), showing the best discrimination.
One asthmatic exhibited mild emphysema.

Conclusions:

Small airway narrowing, potentially due to inflammation or fibrosis, may contribute to non-reversible airflow obstruction in long-standing asthma.
Increased bronchial basement membrane thickness is a significant finding that differentiates asthmatics from non-asthmatics.
These structural changes provide insights into the pathophysiology of chronic airflow obstruction in severe asthma.