FEV1 decline in occupational asthma

Background: In occupational asthma continued workplace exposure to the causative agent is associated with a poor prognosis. However, there is little information available on how rapidly lung function declines in those who continue to be exposed, nor how removal from exposure affects lung function. Methods: Forced expiratory volume in 1 second (FEV₁) was studied in 156 consecutive subjects with occupational asthma (87%...