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Small Airway Function as an Indicator for Persistent Airflow Limitation Asthma: A Retrospective Study
Zhongzhao Wang1,2, Xintong Du1, Yang Luo3
1Department of Respiratory and Critical Care Medicine, Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, China.
The Clinical Respiratory Journal
|March 7, 2026
Summary
Persistent airflow limitation (PAL) asthma, common in older male smokers, is linked to poor asthma control and reduced quality of life. Targeting small airway dysfunction may improve treatment outcomes for PAL asthma.
Area of Science:
- Pulmonology
- Respiratory Medicine
- Clinical Research
Background:
- Asthma is a chronic airway inflammatory disease with varying phenotypes.
- Persistent airflow limitation (PAL) asthma, defined by FEV1/FVC < 0.7 post-bronchodilator, is associated with increased exacerbations.
Purpose of the Study:
- To investigate the clinical characteristics and risk factors of PAL asthma.
- To identify potential therapeutic targets for PAL asthma.
Main Methods:
- Retrospective analysis of 441 asthma patients (224 PAL, 217 non-PAL).
- Comparison of demographics, clinical data, lung function, and laboratory indicators.
- Logistic regression analysis to establish a prediction model for PAL asthma.
Main Results:
- PAL asthma is more prevalent in elderly male smokers.
- PAL asthma patients exhibit higher severity, poorer control, and reduced quality of life.
- PAL asthma is characterized by obstructive ventilatory impairment, small airway dysfunction, and limited bronchodilator response.
Conclusions:
- PAL asthma is associated with poor disease control and diminished quality of life.
- Small airway dysfunction is a key feature of PAL asthma.
- Targeting small airway dysfunction presents a promising therapeutic strategy for PAL asthma.
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