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Circulating eosinophil levels and lung function decline in stable chronic obstructive pulmonary disease: a
Marcello Ferrari1, Michela Pizzini1, Lucia Cazzoletti2
1Dipartimento di Medicina, Unità di Medicina Interna e Medicina Respiratoria, Università di Verona, Verona (VR), Italia.
Summary
In chronic obstructive pulmonary disease (COPD), higher blood eosinophil (bEOS) levels predict faster lung function decline. Inhaled corticosteroids (ICS) are associated with slower disease progression in COPD patients.
Area of Science:
- Pulmonology
- Respiratory Medicine
- Clinical Research
Background:
- Blood eosinophil (bEOS) levels in chronic obstructive pulmonary disease (COPD) are debated regarding their association with disease progression.
- Understanding predictors of COPD progression is crucial for effective patient management.
Purpose of the Study:
- To evaluate if differential white blood cell (WBC) counts, symptoms, and treatments predict lung function decline and exacerbations in COPD patients.
- To investigate the association between blood eosinophil counts and COPD progression.
Main Methods:
- Retrospective study of stable COPD patients with a minimum 3-year follow-up.
- Collected data on lung volumes (FEV1, FVC), WBC counts, exacerbations, smoking status, and treatments (including inhaled corticosteroids - ICS).
- Statistical models (generalized linear model, negative binomial regression) were used to analyze FEV1 decline and exacerbations, adjusting for confounders.
Main Results:
- Higher blood eosinophil counts (bEOS+) were associated with a significantly greater decline in FEV1 compared to lower counts (bEOS-).
- After adjusting for confounders, eosinophil count positively predicted lung function decline, while ICS treatment negatively predicted it.
- Blood eosinophils were not associated with the number of COPD exacerbations during follow-up.
Conclusions:
- Elevated blood eosinophil levels, even within the normal range, predict accelerated FEV1 decline in stable COPD patients.
- Inhaled corticosteroid (ICS) treatment is linked to a slower rate of airflow obstruction progression in COPD.
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