Hyperinflation of the lungs in coal miners

Morgan, William J.; Burgess, Dean B.; Lapp, N. L.; Seaton, Anthony; Reger, R. B.

doi:10.1136/thx.26.5.585

Cited by 40 publications

(9 citation statements)

References 11 publications

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“…The highest value for FEV1 and FVC was accepted. Full details of the methods used are available elsewhere (Morgan, Burgess, Lapp, and Seaton, 1971). The total lung capacity (TLC) was derived by Barnhard's method (Barnhard, Pierce, Joyce, and Bates, 1960) and the residual volume (RV) was calculated by subtracting the FVC from the TLC.…”

Section: Methodsmentioning

confidence: 99%

Lung volumes and flow rates in black and white subjects

Lapp¹,

Amandus²,

Hall³

et al. 1974

Thorax

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. Lung volumes and flow rates in black and white subjects. It has been known for some time that the vital capacity and forced expiratory volume in one second of black subjects are about 12% lower than those of whites of the same age and height. In the present study, total lung capacity and residual volume were also shown to be decreased by about the same percentage. Expiratory flow rates were similarly decreased, but when the difference in lung size was evened out by matching black and white subjects of the same total lung capacity, no significant differences in flow rates were observed.

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Section: Methodsmentioning

confidence: 99%

Lung volumes and flow rates in black and white subjects

Lapp¹,

Amandus²,

Hall³

et al. 1974

Thorax

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“…In contrast, Rogan et al (1961), Ashford et al (1968), and Morgan et al (1971) found evidence of disturbance of lung function which was related to the radiological category in simple pneumoconiosis, and Lyons et al (1972) found evidence of progressive impairment of ventilatory capacity at all radiological stages of the disease which was related to emphysema but not to the radiological category of simple pneumoconiosis. Many of the aforementioned studies were carried out on working miners, thereby excluding the more disabled and elderly ex-miners, and most of them were concerned with a single aspect of lung function tested at one point in time only.…”

mentioning

confidence: 95%

Evolution of disability in coalworkers' pneumoconiosis.

Lyons¹,

Campbell²

1976

Thorax

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Lyons, J. P. and Campbell, H. (1976). Thorax, 31,[527][528][529][530][531][532][533] All three groups showed progressive impairment of ventilation over the whole period of observation. This was most marked in the category B cases but this group had already acquired a substantial proportion of their eventual impairment while still classified radiologically as category A or as simple pneumoconiosis. These findings are not compatible with the view that coalworkers' pneumoconiosis does not cause significant impairment of ventilation until the category B radiological stage is attained; they suggest rather that cases destined to progress to serious disablement show evidence of progressive impairment of ventilation at very much earlier radiological stages. Non-smokers showed a pattern of impairment similar to that of the smokers but were less disabled; the differences, however, were slight and not statistically significant.

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“…Seven of these had clinical chronic bronchitis, leaving 10 in whom the pneumoconiosis may be assumed to have been responsible. The detailed results of the changes in mechanics have been reported elsewhere as part of a comprehensive study of lung mechanics in coal workers (Seaton, Lapp, and Morgan, 1971). simple pneumoconiosis was initially aroused by finding that subjects with nodular lesions (r) had an increased frequency of positive serological tests for rheumatoid arthritis (Caplan, Payne, and Withey, 1962).…”

Section: Detailed Studymentioning

confidence: 99%

Relationship of pulmonary impairment in simple coal workers' pneumoconiosis to type of radiographic opacity

Seaton

Lapp

Morgan

1972

Occupational and Environmental Medicine

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coal workers' pneumoconiosis to type of radiographic opacity. From a group of 1 461 working coal miners who participated in an epidemiological study, 223 men with simple pneumoconiosis were selected on the basis of the type of small rounded opacity noted to be present in their chest films. No differences in spirometry or lung volumes were found between those with the micronodular (q) and those with pinhead (p) opacities. Twenty-five non-smoking miners with category 2 or 3 simple coal workers'pneumoconiosiswere subsequently selected for further pulmonary function testing. Studies of lung volumes and pulmonary mechanics showed no difference between those with the pinhead and micronodular types of opacity; however, transfer factor was somewhat lower in those with the former.

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Hyperinflation of the lungs in coal miners

Cited by 40 publications

References 11 publications

Lung volumes and flow rates in black and white subjects

Lung volumes and flow rates in black and white subjects

Evolution of disability in coalworkers' pneumoconiosis.

Relationship of pulmonary impairment in simple coal workers' pneumoconiosis to type of radiographic opacity

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