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Outcomes in occupational asthma caused by reactive dye after long-term avoidance
1Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea. shcho@plaza.snu.ac.kr
Summary
Occupational asthma (OA) from reactive dyes (RD) causes persistent lung function decline and symptoms, even years after exposure cessation. Long-term outcomes show limited improvement despite treatment.
Area of Science:
- Occupational Medicine
- Pulmonary Immunology
- Allergy
Background:
- Reactive dyes (RD) are recognized causes of occupational asthma (OA).
- Limited data exists on the long-term prognosis of RD-induced OA.
Purpose of the Study:
- To investigate the long-term outcomes of occupational asthma caused by reactive dyes.
- To assess changes in lung function, airway hyper-responsiveness, and inflammation over time.
Main Methods:
- 11 patients with RD-induced OA underwent bronchial challenges and follow-up assessments at ~4.3 and ~13.7 years.
- Evaluations included skin prick tests, pulmonary function tests, methacholine challenges, and sputum analysis.
Main Results:
- Reduced lung function and asthma severity persisted long-term despite exposure avoidance and treatment.
- Non-specific airway hyper-responsiveness remained unchanged.
- Airway eosinophilia was present in most patients, even with high-dose inhaled corticosteroid use.
Conclusions:
- Occupational asthma induced by reactive dyes leads to persistent lung function impairment and symptoms.
- Long-term avoidance of exposure does not guarantee full recovery in RD-induced OA.
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