Occupational Asthma Reference

Ojanguren I, Moullec G, Hobeika J, Miravitlles M, Lemiere C., Clinical and inflammatory characteristics of Asthma-COPD overlap in workers with occupational asthma, Plos One, 2018;13:e0193144,DOI: 10.1371/journal.pone.0193144

Keywords: Canada, OA, COPD, overlap, challenge, SIC, Canada

Known Authors

Catherine Lemière, Hôpital de Sacré Coeur, Montreal, Quebec, Canada Catherine Lemière

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Although Asthma-COPD Overlap (ACO) has been described among populations of subjects with COPD or asthma, ACO has never been described among a population of subjects with occupational asthma (OA).

The aims of this study were to: 1. identify ACO in a population of subjects with OA; and 2. compare the clinical characteristics between ACO and OA.

This retrospective study included all subjects diagnosed with OA between 2000 and 2017 in an OA referral center. Occupational Asthma-COPD Overlap (OACO) was defined as post-bronchodilator FEV1/FVC < 70% and smoking history = 10 pack-years, along with a diagnosis of OA.

Three hundred and four subjects were included, 262 (86.2%) were classified as OA and 42 (13.8%) as OACO. OA subjects presented higher sputum eosinophil counts after a specific-inhalation challenge than subjects with OACO (median [IQR]: 6.5 [17.0] vs 2.3 [3.5]). After adjusting for confounding factors, subjects with OACO were older (OR: 1.10 [1.05; 1.14]) and were taking higher doses of inhaled corticosteroids than OA subjects (OR, 5.20 [1.77; 16.48]). Subjects with OACO were less often atopic than OA subjects (OR, 0.19 [0.07; 0.62]).

Subjects with OACO constitute a distinct clinical and inflammatory phenotype from subjects with OA.

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