Lung Mechanics in Anthracite Coal Workers' Pneumoconiosis.
Chung-CK; Yun-IG; Lee-SH; Cho-KS
NIOSH 1990 Sep:428-435
An investigation was conducted to examine the physiologic evidence of small airway obstruction and significant abnormalities of lung mechanics in anthracite coal miners with coal workers pneumoconiosis (CWP). The subjects were 178 anthracite coal miners with CWP and 25 normal subjects served as a referent group. The miners were divided into two groups. The first consisted of 148 miners with suspected or simple CWP. The second group consisted of 30 miners with progressive massive fibrosis (PMF). The mean values of static compliance, pulmonary recoil pressure at total lung capacity and coefficient of retraction were normal in all categories of CWP. The static compliance was within normal range in most miners with suspected or simple CWP, whereas it was often reduced in miners with PMF. The number of miners with higher coefficient of retraction tended to increase in parallel with the progression of pneumoconiosis in terms of the category of opacity. In simple CWP, the abnormalities of lung functions concerned with gas exchange tended to reflect focal emphysema rather than fibrosis in category 1, and fibrosis rather than focal emphysema in category 3. In severe PMF fibrosis tended to predominate. In 96 suspected or simple CWP miners with normal spirometry and static pressure volume curve, the frequency dependence of compliance was noted in 45 miners at 55 breaths per minute and in 60 miners at 76 breaths per minute. This result appeared to be due to increased resistance to airflow in small peripheral airways.
Epidemiology; Coal-dust; Dust-inhalation; Dust-exposure; Respiratory-system-disorders; Pulmonary-function-tests; Risk-factors; Coal-workers-pneumoconiosis; Coal-miners;
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Respiratory-system-disorders;
Proceedings of the VIIth International Pneumoconioses Conference