Rheumatoid pneumoconiosis: A study in colliery populations in the East Midlands coalfield

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Abstract
The routine chest radiographs of more than 21,000 miners from 23 unselected collieries in the East Midlands were used for a study of rheumatoid pneumoconiosis was used in diagnosis. The prevalence of simple pneumoconiosis categories 1, 2 and 3 was 5.5%, and the P.M.F. 0.59%. There were 55 cases accepted as rheumatoid pneumoconiosis, a prevalence of 0.26%. Thirty-two of these had positive latex fixation or Rose-Waaler tests for rheumatoid factor. The prevalence of P.M.F. was found to increase with increasing simple pneumoconiosis prevalence. A slight correlation between rheumatoid pneumoconiosis and simple pneumoconiosis prevalence was also found, but the bulk of the increase in P.M.F. was due to non-rheumatoid cases. The latter was closely paralleled in incidence by that of category 3 simple pneumoconiosis. Grouped results showed that rheumatoid pneumoconiosis occurred in between 2.3% and 6.2% of all men affected by pneumoconiosis. When examined on a geographical basis all areas exhibited a similar prevalence of rheumatoid cases, with the exception of Mansfield, where there was a significant excess. This excess was not significant when serologically positive cases only were considered. The findings are discussed in the light of the auto-immune theory for the development of massive lesions in the lungs of coal miners.