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Risk of hospitalised bronchiectasis exacerbation based on blood eosinophil counts
1Department of Medicine, Queen Mary Hospital, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.
Summary
Patients with a baseline blood eosinophil count (BEC) below 250 cells/µL face a higher risk of hospitalised bronchiectasis exacerbations. This finding highlights BEC as a key indicator for predicting severe exacerbations in bronchiectasis patients.
Area of Science:
- Pulmonology
- Clinical Medicine
- Respiratory Diseases
Background:
- Growing recognition of airway disease phenotyping.
- Eosinophilic phenotype proposed in bronchiectasis.
- Lack of evidence on eosinophils and exacerbation risk.
Purpose of the Study:
- Investigate the association between baseline blood eosinophil count (BEC) and hospitalised bronchiectasis exacerbations.
- Validate findings using an independent cohort.
Main Methods:
- Retrospective cohort study design.
- Analysis of 318 participants over 24 months.
- Identification of a significant cut-off BEC level.
Main Results:
- 11.6% of participants experienced a hospitalised exacerbation.
- Mean BEC was lower in participants with exacerbations (135 cells/µL) vs. without (188 cells/µL).
- A BEC of 250 cells/µL was the most significant predictor of hospitalised exacerbations, validated independently.
Conclusions:
- Patients with stable-state BEC below 250 cells/µL are at increased risk of hospitalised bronchiectasis exacerbations.
- BEC serves as a valuable biomarker for predicting exacerbation risk.
- Further research may explore targeted interventions based on BEC levels.
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