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Pneumoconiosis from agricultural dust exposure among young California farmworkers.

Authors
Schenker-MB; Pinkerton-KE; Mitchell-D; Vallyathan-V; Elvine-Kreis-B; Green-FHY
Source
Environ Health Perspect 2009 Jun; 117(6):988-994
NIOSHTIC No.
20035492
Abstract
BACKGROUND: Agricultural workers are exposed to airborne pollutants, including organic and inorganic (mineral) dusts. OBJECTIVES: Lung autopsy specimens from consecutive coroner's cases of Hispanic males in Fresno County, California, (n = 112) were obtained to determine whether mineral dust exposure in agricultural work leads to pneumoconiosis. METHODS: The left lung was fixed by inflation. We evaluated airway and parenchymal pathology using standardized diagnostic criteria and semiquantitative grading schemata, including the grading of small airways for fibrosis and birefringent mineral dust particles. We analyzed lung dust burden on a subset of 37 lungs following bleach digestion, using scanning electron microscopy (SEM), X-ray spectrometry (XRS) and image analysis, and by X-ray diffraction for crystalline silica (CSi). Farmworkers comprised 51.5% and nonfarmworkers 48.5% of the samples. RESULTS: Proximal airways demonstrated little mineral dust accumulation, but membranous and respiratory bronchioles had wall thickening, remodeling, and inflammation associated with carbonaceous and mineral dust deposition. These changes were independently associated with agricultural work, cigarette smoking, and increased age. Mineral dust small airways disease, pneumoconiosis (macules and nodules), and pathologic changes consistent with chronic bronchitis, emphysema, and interstitial fibrosis predominated in farmworkers compared with nonfarmworkers. CSi, determined gravimetrically, and aluminum silicate particles, determined by SEM/XRS, were increased in the lungs of farmworkers compared with nonfarmworkers and were significantly (p < 0.05) associated with small airway disease and pneumoconiosis. CONCLUSION: Mineral dust exposure is associated with increased small airway disease and pneumoconiosis among California farmworkers; however, the clinical significance and natural history of these changes remains to be determined.
Keywords
Agricultural-industry; Agricultural-processes; Agricultural-workers; Bronchial-asthma; Chronic-exposure; Chronic-inflammation; Dust-analysis; Dust-exposure; Dust-inhalation; Exposure-assessment; Exposure-levels; Farmers; Inhalation-studies; Laboratory-testing; Lung-disorders; Lung-function; Lung-irritants; Occupational-diseases; Occupational-exposure; Occupational-health; Occupational-respiratory-disease; Pollutants; Pulmonary-disorders; Pulmonary-function; Pulmonary-system; Pulmonary-system-disorders; Respiratory-hypersensitivity; Respiratory-irritants; Respiratory-system-disorders; Silicates; Silica-dusts; Respirable-dust; Statistical-analysis; Respiratory-system-disorders; Lung-disease; Epidemiology; Demographic-characteristics; Farmers; Agricultural-industry; Agricultural-workers; Agriculture; Mineral-dusts; Author Keywords: agriculture; dust; farmworker; interstitial fibrosis; pneumoconiosis; respiratory; small airways disease
Contact
M. Schenker, University of California at Davis, School of Medicine, One Shields Ave., TB168, Davis, CA 95616-8638
CODEN
EVHPAZ
Publication Date
20090601
Document Type
Journal Article
Email Address
mbschenker@ucdavis.edu
Funding Amount
1055222
Funding Type
Cooperative Agreement
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U07-CCU-906162
Issue of Publication
6
ISSN
0091-6765
NIOSH Division
HELD
Priority Area
Services
Source Name
Environmental Health Perspectives
State
CA; WV
Performing Organization
University of California - Davis
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