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(Chest. 1994;106:1050-1055.)
© 1994 American College of Chest Physicians

Respiratory Symptoms and Lung Function in Animal Feed Workers

Tim H.J.M. Jorna MSc.1; Paul J.A. Borm PhD.2; Jos Valks MD3; Remco Houba MSc.4; and Emiel F.M. Wouters MD, PhD, FCCP1

1 From the Department of Pulmonary Diseases, University of Limburg, Maastricht
2 From the Department of Health Risk Analysis and Toxicology, University of Limburg, Maastricht
3 From the Department of Occupational Health Service, Venray
4 From the Department of Epidemiology and Public Health, Wageningen, the Netherlands

In a study among 194 male workers exposed to endotoxin-containing organic dust in animal feed mills, lung function was measured by flow volume curves and impedance measurements and respiratory symptoms were recorded by means of a validated questionnaire. The aims were to detect and localize airway obstruction caused by fodder dust and endotoxin, and to relate respiratory symptoms to both types of lung function measurements. Flow volume and impedance parameters were significantly related to present exposure. All impedance parameters, of the spirometric measures only FEF25, were significantly related to cumulative dust or endotoxin exposure. The changes in impedance parameters were for overall increasing resistance at 8 Hz and decreasing reactance at 8 Hz, reflecting an increase in peripheral airflow obstruction, with increasing exposure. The changes in all lung function parameters were more strongly related to (cumulative) endotoxin exposure than to inspirable dust exposure. All impedance parameters and FEV1 showed a good correlation with complaints of chronic bronchitis and breathlessness. Impedance measurement of the respiratory system proved to be a useful tool for objectively assessing (early) airflow obstruction in workers exposed to inspirable dust and endotoxin and in localizing airflow obstruction.

Key Words: airflow obstruction • early diagnosis • endotoxin • flow volume curves • forced-oscillation technique • inspirable dust • occupational

Submitted on August 30, 1993
Accepted on February 15, 1994




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