The purpose is to compare clinical, functional, professional and socio-economical characteristics of patients with occupational asthma and work aggravated asthma. Secondary purposes are: * to evaluate diagnostic value of new non-invasive techniques such as exhaled nitric oxide and cytology of induced expectoration; * to estimate medical-social becoming of diagnosed work-related asthma after one year; * to establish a biobank of blood samples of individuals with work related asthma for measurement of cytokines and search for genetic polymorphisms associated with asthma.
Participants with work related asthma or suspected work related asthma will obtain a precise diagnosis concerning severity and control of respiratory disorder and also the possible effect of professional environment on the disorder. Their medical care and medico-legal care, in case of recognition of occupational disease, could be ameliorated. In general, this study will allow the harmonization of diagnostic care and medical, medico-professional and medico-legal management of cases of work related asthma in specialized hospitals.
Study Type
OBSERVATIONAL
Enrollment
400
Biobank. Analysis of cytokines and DNA polymorphisms
Centre de consultation de pathologies professionnelles, Hôpital Pellegrin - CHU de Bordeaux
Bordeaux, France
Centre de consultation de pathologies professionnelles, Hôpital côte de Nacre - CHU de Caen
Caen, France
Classification of suspected work-related asthma in occupational asthma, work aggravated asthma, non-work-related asthma
Interpretation of diagnostic algorithm of study
Time frame: Inclusion
Nitric oxide level
Bronchial inflammation marker
Time frame: Inclusion
Cytology of induced expectoration
Bronchial inflammation marker
Time frame: Inclusion
Nonspecific bronchial hyperreactivity evaluated with metacholine bronchial challenge test and/or isocapnic hyperventilation test
Time frame: Inclusion
Control of asthma symptoms evaluated with Asthma Control test and peak exploratory flow
Time frame: Inclusion
Severity of symptoms
Time frame: Inclusion
Costs of different types of asthma
Direct and induced costs
Time frame: Inclusion and after 1 year
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