Comparative study of audiometrics tests on metallurgical workers exposed to noise only as well as noise associated to the handling of chemical products.
Exposure to ototoxic chemical products in the presence or absence of noise can cause irreversible injury to the hearing of workers for a significantly short period of exposure period.


OBJECTIVE
to perform a comparative study, through audiometric tests, in workers exposed to noise only and noise associated with chemical products.


METHODS
155 steel workers (18 - 50 years) exposed to noise (group I), and exposed to noise and chemical products (group II) for a period that varies from 3 to 20 years.


RESULTS
significant difference in the rate of occupational hearing loss in the right ear between groups I (3.6%) and II (15.5%). A significantly higher rate of occupational hearing loss in group II (18.3%) and I (6%). With respect to the average time of exposure to aggressive agents, group I was exposed by a significantly higher time. Retrospective study.


CONCLUSIONS
The fact that the right ear was more affected in group II is controversial and should be better investigated in the future, since some studies show that the left ear would be more prone to noise-induced hearing loss.


CONCLUSIONS
group II had proportionally a higher rate of hearing loss when compared with group I, even after having been exposed to aggressive agents for a lower average time.
Botelho
Carla Tomaz
CT
Centro de Especialização em Fonoaudiologia Clínica.
Paz
Anna Paulla Maia Lopes
AP
Gonçalves
André Martins
AM
Frota
Silvana
S
D000293:Adolescent; D000328:Adult; D001299:Audiometry; D001309:Auditory Threshold; D016022:Case-Control Studies; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009623:Noise, Occupational / Q000009:adverse effects* / Q000706:statistics & numerical data; D016273:Occupational Exposure / Q000009:adverse effects* / Q000706:statistics & numerical data; D015995:Prevalence; D013997:Time Factors; D055815:Young Adult