[Study on the working noise in BYPC and the effects caused by working noise on the workers' vestibular and auditory function].
OBJECTIVE
In order to observe the kinds and intensity of the working noise of Yansan Petrochemical Co. and the effects caused by the working noise on the workers' vestibular and auditory function.


METHODS
The intensity and frequency of the working noise were recorded by exactolnoisemeter in the workshop. One hundred and seventeen workers were tested in routine pure-tone tested method. The SPVN and ABR were tested within fifty-one workers of all.


RESULTS
The working noise of Yansan Petrochemical Co. belongs to the broad band and steady noise. The intensity of the working noise were during 85.7-104.0 dB(A) and the main frequency were during 1-8 kHz. About 59 percent workers who exposed to the working noise had hearing loss. The most hearing-loss were in the high frequency. The hearing-loss of speech frequency were slight. Workers who have more six years standing have obviously increased hearing-loss than the workers who have less five years standing. There were significant differences the ABR thresholds and wave-interval between the tested and controlled groups. The SPVN and CP were abnormal in more than 17.4 percent workers with hearing loss.


CONCLUSIONS
The working noise of Yansan Petrochemical Co. belongs to the broad band and steady noise. Working noise can lead to workers' hearing loss of certain degrees who exposed in the noise for a long time. Obvious correlation was not defined between the hearing-loss and the abnormal vestibular response group.
Wang
H
H
Department of Otolaryngology, Worker's Hospital, Yansan Petrochemical Co, Beijing 100250.
Jiang
Z
Z
Duan
C
C
Wang
Z
Z
Jiang
Z
Z
Feng
B
B
Zhang
S
S
D000328:Adult; D001301:Audiometry, Pure-Tone; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006317:Hearing Loss, Noise-Induced / Q000453:epidemiology* / Q000503:physiopathology; D006801:Humans; D008297:Male; D009623:Noise, Occupational; D014724:Vestibular Function Tests; D014722:Vestibule, Labyrinth / Q000503:physiopathology*