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Long-Term Follow-Up of Cluster-Based Diisocyanate Asthma Phenotypes
Paola Mason1, Filippo Liviero1, Piero Maestrelli1
1Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, Padova, Italy.
Summary
Occupational asthma (OA) outcomes vary. Patients with toluene diisocyanate-induced OA in cluster 2 showed a trend toward better remission, with age at diagnosis being a key predictor.
Area of Science:
- Occupational Medicine
- Pulmonology
- Immunology
Background:
- Outcomes for occupational asthma (OA) are highly variable.
- Understanding factors influencing OA prognosis is crucial for patient management.
Purpose of the Study:
- To evaluate the long-term impact of patient clustering at diagnosis on diisocyanate-induced occupational asthma outcomes.
- To identify predictors of remission in occupational asthma.
Main Methods:
- Fifty-six patients with confirmed diisocyanate-induced OA underwent cluster analysis based on age, BMI, and FEV1/FVC.
- Patients were categorized into clusters based on the specific diisocyanate (toluene or methylene).
- Remission was defined by symptom resolution, cessation of asthma medication, and normal lung function for one year.
Main Results:
- Sixteen patients achieved OA remission, displaying better lung function and younger age at diagnosis.
- Cluster 2, comprising toluene diisocyanate-sensitized patients, showed a higher remission rate (50%) compared to cluster 1 (25%) and cluster 3 (22.5%), though not statistically significant.
- Age at diagnosis emerged as a significant predictor of OA remission.
Conclusions:
- Age at diagnosis is a strong determinant of occupational asthma remission.
- A favorable trend in diisocyanate OA outcome was observed in cluster 2 (toluene diisocyanate), warranting further investigation.
- Further studies are needed to validate the prognostic significance of these clusters in diisocyanate-induced occupational asthma.
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