| Abstract: | A clinical survey has been performed of 1640 miners engaged in deep mines characterized by steep geological strata, as a result of which increased disorders have been registered in audio, nervous, cardiovascular and respiratory systems. The maximum shifts of the acoustic analizer were identified in the frequency range of 4000 hertz by 10-12 years and in the speech frequency range by 14 years. Audiologic tests revealed assymmetries in auditory threshold shifts of both right and left ears in all 1640 cases studied. |
