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Will nonasthmatic eosinophilic bronchitis develop into chronic airway obstruction?: a prospective, observational
Kefang Lai1, Baojuan Liu1, Danyuan Xu1
1State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.
Chest
|April 24, 2015
Summary
Over half of nonasthmatic eosinophilic bronchitis (NAEB) patients relapse, often linked to persistent sputum eosinophilia and allergic rhinitis. However, NAEB does not typically progress to chronic airflow obstruction despite airway dysfunction.
Area of Science:
- Pulmonology
- Allergy and Immunology
- Respiratory Medicine
Background:
- Nonasthmatic eosinophilic bronchitis (NAEB) is a condition characterized by eosinophilic airway inflammation without asthma.
- The long-term prognosis and potential for progression to chronic obstructive lung disease remain incompletely understood.
Purpose of the Study:
- To investigate the relapse rate in patients diagnosed with NAEB.
- To assess the likelihood of NAEB progressing to chronic airflow obstruction over an extended follow-up period.
Main Methods:
- A cohort of 234 NAEB patients were identified, with 141 followed for over a year (median 4.1 years).
- Evaluations included clinical symptoms, sputum eosinophil counts, spirometry, and bronchial hyperresponsiveness.
- A linear mixed model was used to analyze the relationship between time and lung function parameters.
Main Results:
- 59.6% of NAEB patients experienced relapse post-treatment.
- Risk factors for relapse included allergic rhinitis and persistent sputum eosinophilia after inhaled corticosteroid treatment.
- Mild asthma developed in 5.7% of patients; however, no progressive decline in FVC, FEV1, or FEV1/FVC was observed.
- Small airway dysfunction (decreased MMEF) increased over time, particularly in the relapse group.
Conclusions:
- More than 50% of NAEB patients experience recurrent episodes, often associated with persistent sputum eosinophilia and allergic rhinitis.
- Despite increased small airway dysfunction over time, the NAEB cohort in this study did not develop chronic airflow obstruction.
