Which factors increase the probability of a favourable prognosis after a diagnosis of occupational asthma?

The following references have been associated with this question by users of this website. They do not form part of the BOHRF occupational asthma guidelines.

Cedd Burge Anees 2006 Complete removal from exposure required to reduce accelerated FEV1 decline
burgeps Rachiotis 2007 Younger age and shorter exposure favoured complete resolution. Exposure to high molecular weight agents was associated with a greater propotion with increased non-specific reactivity at follow-up than those exposed to low molecular weight agents (many used to believe the converse).
burgeps Pisati 2007
burgeps Miedinger 2010
burgeps Labrecque 2011 Really a cross-sectional study at the start of a surveillance programme compared with workers diagnosed with occupational asthma presenting clinically (historical controls). Those identified by surveillance had less NSBR and recovered better than the historical controls (2 years after removal from exposure no treatment and normal NSBR 34% vs 16%, p=0.02). They also cost the Quebec compensation scheme, which includes less (11,893 Canadian $ including retraining compared with Can $19,462 for the historical controls.
burgeps Malo 2008
burgeps Feary 2020 This paper followed up workers with confirmed occupational asthma mainly to laboratory animals and baking flour. It showed the benefits of occupational health services that refer those who have failed surveillance for occupational asthma to a specialist unit, as opposed to those who find there way there through other routes. Those referred by occupational health were more likely to be employed one year after diagnosis, were more likely to have been removed from the cause, and have a better quality of life. In addition it confirmed the benefit of early removal from the cause once occupational asthma developed.

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