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Pleural plaques and their effect on lung function in Libby vermiculite miners
Kathleen A Clark1, J Jay Flynn2, Julie E Goodman3
1Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC.
Chest
|May 10, 2014
Summary
Asbestos-related pleural plaques (PPs) alone do not significantly impact lung function in Libby miners. However, combined with interstitial fibrosis, PPs were associated with reduced total lung capacity.
Area of Science:
- Occupational Health
- Pulmonary Medicine
- Radiology
Background:
- Inconsistent findings exist regarding asbestos-related pleural plaques (PPs) and lung function.
- Previous studies often used less accurate methods like chest radiographs and simple spirometry.
- High-resolution CT (HRCT) and complete pulmonary function tests (PFTs) offer more precise assessment.
Purpose of the Study:
- To evaluate the effect of PPs on lung function in Libby vermiculite miners.
- Utilized HRCT scanning and comprehensive PFTs for accurate assessment.
- Investigated the specific impact of PPs in an occupational asbestos exposure cohort.
Main Methods:
- Retrieved HRCT and PFT data from 166 Libby vermiculite miners (2000-2012).
- Employed multivariate regression analyses with Tukey adjustment.
- Controlled for age, BMI, smoking history, employment duration, and years since exposure.
Main Results:
- Nearly 90% of miners exhibited PPs on HRCT.
- No significant lung function differences were observed between miners with PPs alone and those with normal scans.
- Miners with both PPs and interstitial fibrosis showed significantly decreased total lung capacity (p=.02).
Conclusions:
- Asbestos-related pleural plaques in isolation do not significantly affect lung function.
- Interstitial fibrosis, in conjunction with PPs, is linked to reduced lung capacity.
- Age, smoking history, and BMI are significant factors influencing lung function abnormalities.
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