Examinations were carried out on the frequency of the occurrence of myocardiopathy and arterial hypertension in 492 miners and 175 manual workers employed on mines surface. Physical symptoms of cardiac muscle degeneration were found in 7,3%, electrocardiographical symptoms in 11,1%, whereas in 9,9% miners hypertension was found. No significant difference between the frequency of these diseases in pit miners, as compared with those manual workers working on the surface of the mines, was found.
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