Thickening of pulmonary interlobar fissures: exposure-response relationship in crocidolite and amosite miners

ABSTRACT In a cross-sectional study of all white and mixed-race men employed at South African crocidolite and amosite mines, data on duration of asbestos exposure and radiological findings were available for 162 men, 94% of the total population. Postero-anterior radiographs were read by three experi...

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Bibliographic Details
Published in:British Journal of Industrial Medicine 1979-08, Vol.36 (3), p.195-198
Main Authors: Solomon, A., Irwig, L. M., Sluis-Cremer, G. K., Thomas, R. Glyn, Toit, R. S. J. Du
Format: Article
Language:English
Subjects:
Adult
Age Factors
Asbestos
Asbestosis - diagnostic imaging
Chest
Cross-Sectional Studies
Dose response relationship
Epidemiology
Humans
Lung - diagnostic imaging
Male
Medical research
Mining
Pleura - diagnostic imaging
Radiography
Radiology
South Africa
Time Factors
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Summary:ABSTRACT In a cross-sectional study of all white and mixed-race men employed at South African crocidolite and amosite mines, data on duration of asbestos exposure and radiological findings were available for 162 men, 94% of the total population. Postero-anterior radiographs were read by three experienced readers. Abnormality was regarded as present if reported by at least two of them. The reading included an assessment of whether interlobar fissures were not visible, were visible but not thickened, or were thickened according to criteria shown in a reference radiograph. Fissures which were visible but not thickened were seen in almost half the men and were not more common in men with longer asbestos exposure. On the other hand, thickened fissures increased in prevalence from about 2% in those who had worked with asbestos for 7 years or less, to 25% in those with more than 15 years' asbestos exposure. Some other asbestos-associated pleural or parenchymal abnormality occurred in 69% of men with thickened fissures. The prevalence of thickened fissures as an isolated abnormality was also related to the duration of asbestos exposure. Because its prevalence is related to duration of exposure, and its recognition is not subject to excessive inter-observer variation, we suggest that thickening of the fissures is a valuable sign in the radiological assessment of workers exposed to asbestos.
ISSN:0007-1072
1351-0711
1470-7926
DOI:10.1136/oem.36.3.195