It is now apparent on the basis of large population studies of cotton dust-exposed workers that respiratory responses occur that do not fit the definition of byssinosis suggested by Schilling et al. These responses include mill fever, acute bronchoconstriction demonstrated by across-shift decline in FEVi, chest tightness, and chronic bronchitis.
A number of cross-sectional studies have been performed which examine respiratory disease in cotton textile workers. These surveys have described both the prevalence of byssinosis and nonspecific respiratory symptoms as well as the acute drops in lung function across a work shift that occur among cotton textile workers. However, there are only a few longitudinal studies that examine the development of respiratory symptoms and lung function decline in such workers.
In all studies of textile workers there is the implicit assumption that acute respiratory symptoms are reversible (ie, with cessation of exposure) or vary substantially from survey to survey” while chronic symptoms persist. Studies to date have not examined the significance of symptom incidence or persistence in a longitudinal survey, nor have they addressed the issue of the significance of variability in symptoms and across-shift ventilatory change in relation to chronic lung function loss. Canadian pharmacy levitra read more The objective of this study was to examine longitudinal variability in symptoms and across-shift change in ventilatory function in cotton textile workers and the relationship between this variability and the 5-year loss of pulmonary function. The extent to which across-shift change in ventilatory function was related to observed differences in environmental exposures, variability in symptom reporting, and longitudinal change in lung function were also assessed.