Serum angiotensin converting enzyme, ceruloplasmin, and lactic dehydrogenase in anthracosilicosis and anthracosilicotuberculosis.

SUBJECTS On the basis of changes seen in the chest x ray films 95 male anthracosilicotic patients were recruited with the study. They included 24 suspected cases, 25 cases in category 1, 24 in category 2, and 22 in category 3. In addition, the study included 20 cases of anthracosilicotuberculosis. The ages of the subjects ranged from 32 to 73 (mean 48-7 +±9.1) with a working life from six to 34 years (mean 12-8 + 4 8) and all had been exposed to both silica and coal dust in coal mines. Twenty four male workers with mixed dust exposure with an age range of 30-63 (mean 48-1 + 5 3) and 26 healthy men with no dust exposure and an age range of 26-55 (mean 44-3 + 6-7) served as controls.