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Pleural plaques and lung function in construction workers exposed to asbestos
European Journal of Respiratory Diseases
|January 1, 1981
Summary
Asbestos exposure in construction workers with pleural plaques can lead to small airway disease. This asbestos-related pulmonary dysfunction showed reduced expiratory flow rates and increased closing volume.
Area of Science:
- Occupational Medicine
- Pulmonary Medicine
- Environmental Health
Background:
- Asbestos exposure is a known risk factor for respiratory diseases.
- Construction workers are a population at risk for asbestos exposure.
- The impact of asbestos exposure on small airways requires further investigation.
Purpose of the Study:
- To evaluate respiratory symptoms and pulmonary function in asbestos-exposed construction workers.
- To identify specific pulmonary function changes associated with asbestos exposure, particularly in relation to pleural plaques.
- To differentiate the effects of asbestos exposure from smoking on lung function.
Main Methods:
- Study included three groups: asbestos-exposed with pleural plaques (Group I), asbestos-exposed without pleural plaques (Group II), and non-exposed controls (Group III).
- Respiratory symptoms were assessed through questionnaires.
- Pulmonary function was evaluated using spirometry, including measurements of maximal expiratory flow rates (MEF50, MEF25), closing volume (CV), and transfer factor for carbon monoxide (CO).
Main Results:
- Group I (asbestos-exposed with pleural plaques) showed a 4-5 times higher frequency of chronic bronchitis and productive cough compared to controls (Group III).
- Significant reductions in expiratory flow rates (MEF50, MEF25) and a marked increase in closing volume (CV) were observed in Group I.
- The differences in CV, MEF50, and MEF25 were more pronounced between exposed and non-exposed non-smokers than between exposed and non-exposed smokers. Group II showed no significant differences compared to controls.
Conclusions:
- Asbestos exposure, even when primarily manifesting as pleural plaques, can cause pulmonary dysfunction.
- The observed changes in MEF50, MEF25, and CV suggest that asbestos exposure leads to small airway disease.
- Pulmonary function impairment in asbestos-exposed individuals may be independent of smoking status, highlighting the direct impact of asbestos.