Document Detail

Irregularly shaped small shadows on chest radiographs, dust exposure, and lung function in coalworkers' pneumoconiosis.
MedLine Citation:
PMID:  3342187     Owner:  NLM     Status:  MEDLINE    
The predominant shapes of small opacities on the chest radiographs of 895 British coalminers have been studied. The aims were to determine whether irregular (as distinct from rounded) small opacities can be identified reproducibly, whether their occurrence is related to dust exposure, and whether they are associated with excess prevalence of respiratory symptoms or impairments of lung function. Six of the doctors responsible for regular radiological surveys of all British coalminers each classified all 895 radiographs twice and independently, using the International Labour Organisation's 1980 classification system. The majority view was that 39 films showed predominantly irregular small opacities, 131 showed predominantly small rounded opacities, and 587 showed no small opacities. Readers' opinions varied about the presence and shapes of shadows on the other 138 films. In general, consistency between readers (and within readers on repeated viewings) was satisfactory. The occurrence and profusion of irregular shadows were related significantly both to the men's ages and additionally to their cumulative exposure to respirable coalmine dust as determined from 15 years' dust monitoring close to where the miners had worked. For any given level of exposure, the average level of profusion of the small irregular opacities was less than the corresponding profusion of small rounded opacities. The prevalence rates of chronic cough and phlegm, and of breathlessness, were higher in those with small irregular opacities than in those with no small opacities (category 0/0), but the differences were not statistically significant after adjustment for other factors including smoking habits. The presence of irregular (but not rounded) small shadows was associated with an impairment in respiratory function averaging about 190 ml deficits in both FEV1 and FVC. These deficits were not explicable in terms of the men's ages, body sizes, and smoking habits and they were in addition to the lung function losses attributable to the miners' dust exposure as such. It is concluded that the presence and profusion of small irregular opacities should be taken into consideration when assessing the severity of coalworkers' simple pneumoconiosis.
H P Collins; J A Dick; J G Bennett; P O Pern; M A Rickards; D J Thomas; J S Washington; M Jacobsen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of industrial medicine     Volume:  45     ISSN:  0007-1072     ISO Abbreviation:  Br J Ind Med     Publication Date:  1988 Jan 
Date Detail:
Created Date:  1988-03-31     Completed Date:  1988-03-31     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0370637     Medline TA:  Br J Ind Med     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  43-55     Citation Subset:  IM    
Institute of Occupational Medicine, Edinburgh, UK.
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MeSH Terms
Age Factors
Coal Mining*
Disability Evaluation
Dust / adverse effects
Forced Expiratory Volume
Lung / physiopathology,  radiography*
Pneumoconiosis / physiopathology,  radiography*
Vital Capacity
Reg. No./Substance:

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