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Respiratory Exacerbations and Lung Function Decline in People with Smoking History and Normal Spirometry
Spyridon Fortis1,2, Matthew Strand3, Surya P Bhatt4
1Center for Access & Delivery Research & Evaluation, Iowa City Veterans Affairs Health Care System, Iowa City, Iowa.
American Journal of Respiratory and Critical Care Medicine
|February 13, 2025
Summary
Respiratory exacerbations worsen lung function decline in smokers with normal spirometry. Severe exacerbations increase mortality risk, highlighting the need for early intervention in this population.
Area of Science:
- Pulmonology
- Respiratory Medicine
- Clinical Epidemiology
Background:
- Chronic obstructive pulmonary disease (COPD) exacerbations significantly impact lung function.
- The effects of exacerbations on individuals with smoking history but normal spirometry remain unclear.
Purpose of the Study:
- To investigate the association between respiratory exacerbations and lung function decline.
- To assess the link between exacerbations and mortality in smokers with normal spirometry.
Main Methods:
- Analysis of COPDGene study data from participants with smoking history and normal spirometry.
- Examined exacerbations between baseline and 5-year follow-up in relation to FEV1 decline and all-cause mortality.
Main Results:
- Each exacerbation correlated with a 2.96 ml/yr FEV1 decline.
- Severe exacerbations were linked to a 14.6 ml/yr FEV1 decline and nearly doubled mortality risk (aHR 1.97).
Conclusions:
- Respiratory exacerbations contribute to lung function decline in smokers with normal spirometry.
- Severe exacerbations are associated with increased mortality in this cohort.
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