SI "Institute for Occupational Health of NAMS of Ukraine", Kyiv
Introduction. The coal mining industry, where there are recorded over 83 % all cases of occupational diseases, is the main portion in formation of occupational pathology in Ukraine. Also, this branch is the most dangerous for workers’ health in respect of developing occupational sensorineural deafness (OSND). The occupational deafness takes the first place among occupational diseases in many countries of the world and is recorded in 10–56 % workers, engaged in this branch. In Ukraine sensorineural deafness (SND) takes the 4–5th place in the structure of morbidity.
Purpose of the study. To investigate hygienic work conditions and to define main factors of production in underground coal mines, causing OSND development.
Materials and methods. An analysis of sanitaryhygienic work conditions of 87 miners of underground coal mines: sinkers – 28, faceworkers – 25, miners of the coalface (MCF). Sinkers were with work experience in noisy conditions of (17,90 ± 1,00) years, faceworkers – (23,10 ± 1,00) years, MCF – (22,20 ± 2,00) years, on the average.
Results. The equivalent noise levels in sinkers, faceworkers and MCF were as follows: (93,6 ± 4,9) dBА, (92,9 ± 5,5) dBА, (86,5 ± 6,04) dBА, respectively, work experience noise levels (108,14 ± 5,54) dBА, (105,5 ± 4,91) dBА, (97,9 ± 2,53) dBА and there were no significant difference. Vibration parameters in sinkers, faceworkers and MCF showed, also, no difference, and made (116,7 ± 9,1) dB, (117,0 ± 9,5) dB, (97,2 ± 2,9) dB, respectively. However work experience of vibration doses in sinkers differed significantly (129,7 ± 9,1) dB, as well as in faceworkers (130,7 ± 9,5) dB in comparison with MCF (110,2 ± 2,9) dB (р < 0,05).
Conclusion. Noise in combination with vibration and the force posture are defined as main etiological factors in SND development in miners of main professions. According to assessment of sanitaryhygienic work conditions the work of sinkers is referred to Class3, stage 4 of harmfulness, that of faceworkers – to Class 3, stage 3 and MCF – to Class 3, stage 2, when development of pathology of the organ of hearing can be recorded as well as other types of occupational diseases.
Key words: occupational sensorineural deafness, coal mine industry, noise, vibration, work experience doses