Hearing conditions of gas stations attendants
Condição auditiva de frentistas
Tania Maria Tochetto; Lenita da Silva Quevedo; Márcia do Amaral Siqueira
Abstract
Purpose: to evaluate the hearing threshold in the conventional frequencies and high frequencies, and the integrity of the acoustic reflex, in subjects exposed to fuels.
Method: attendants of three gas stations were evaluated in Santa Maria/RS. After the adaptation to the inclusion criteria, the sample was composed of 24 subjects. It was used the Pure Tone Audiometry, high frequency audiometry and acoustic immitance assessment to evaluate the sample. The time of exposition ranged from one to seventeen years. The control group was composed by 24 not exposed subjects.
Results: the average of the thresholds of the PTA and of the high frequency audiometry was superior in the study group in all the tested frequencies. A statistically significant difference of thresholds was verified on the frequencies of 0,5 (p=0,004), 2 (p=0,001), 3 kHz (p=0,025), and frequencies of 9 (p=0,007) e 10 kHz (p=0,026). In 16, 18, 20 kHz a greater absence of responses was observed in the study group (p>0, 05). Also it was observed a greater absence of acoustic reflexes (ipsilateral and contralateral) at the study group, on the right ear. On the left ear, there was no difference between the groups, for the occurrence of ipsilateral reflex. The absence of the contralateral reflex was superior in the study group on all frequencies tested.
Conclusion: individuals exposed to fuels with normal hearing thresholds may have cochlear and central alterations.
Keywords
Resumo
Objetivo: avaliar os limiares auditivos nas frequências convencionais e altas frequências, e ainda a integridade do arco reflexo, em frentistas.
Método: foram avaliados frentistas de três postos de gasolina da cidade de Santa Maria/RS. Após adequação aos critérios de inclusão, a amostra ficou composta por 24 frentistas expostos a combustíveis, 21 do gênero masculino e três do gênero feminino, com faixa etária entre 20 e 40 anos. Os exames utilizados foram audiometria tonal liminar, audiometria de altas frequências e imitanciometria. O tempo de exposição variou de um a 17 anos. O grupo controle foi composto por 24 sujeitos não expostos a qualquer agente nocivo à audição.
Resultados: a média dos limiares da audiometria tonal liminar e da audiometria de altas frequências foi superior no grupo estudo em todas as frequências testadas. Verificou-se diferença de limiar estatisticamente significante nas frequências de 0,5 (p=0,004), 2 (p=0,001) e 3 kHz (p=0,025), e nas frequências de 9 (p=0,007) e 10 kHz (p=0,026). Os limiares das frequências de 12,5 e 14 kHz não diferiram estatisticamente (p>0,05). Em 16, 18 e 20 kHz foi observada maior ausência de respostas no grupo estudo (p>0,05). Também se observou maior ausência de reflexos acústicos (ipsi e contralateral) no grupo estudo, na orelha direita. Na orelha esquerda, não houve diferença entre os grupos, para a ocorrência do reflexo ipsilateral. A ausência de reflexo contralateral foi maior no grupo estudo em todas as frequências testadas.
Conclusão: frentistas com limiares auditivos normais podem apresentar alterações cocleares e centrais.
Palavras-chave
Referencias
1. Moller C, Odkvist L, Larsby B, Tham R, Ledin T, Bergholtz L. Otoneurological findings in workers exposed to styrene. Scand J Work Environ Health. 1990;16:189-94.
2. Sulkowski WJ, S Kowalska, Matyja W, Guzek W, W Wesolowski, Szymczak W, et al. Effects of occupational exposure to a mixture of solvents on the inner ear: A field study. Int J Occup Med Environ Health. 2002;15:247-56.
3. Johnson AC, Morata TC. Occupational exposure to chemicals and hearing impairment. The Nordic Expert Group for Criteria Documentation of Health Risks from Chemicals, 2010.
4. Morata TC, Dunn DE, Kretschmer LW, Lemasters GK, Keith RW. Effects of occupational exposure to organic solvents and noise on hearing. Scand. J. Work Environ. Health. 1993;19(4):245-54.
5. Morata TC, Fiorini AC, Fischer FM, Colacioppo S, Wallingford KM, Krieg EF, et al. Toluene-induced hearing loss among rotogravure printing workers. Scand J Work Environ Health. 1997;23:289-98.
6. Cary R, Clarke S, Delie J. Effects of combined exposure to noise and toxic substances: Critical review of literature. Ann Occup Hyg. 1997;41:455-65.
7. Venet T, Rumeau C, Campo P, Rieger, B, Thomas A, Cour C. Neuronal Circuits involved in the middle-ear acoustic reflex. Toxicol. Sci. 2011;119(1):146-55.
8. Momensohn-Santos TM, Russo ICP, Brunetto-Borgianni LM. Interpretação dos resultados da avaliação audiológica. In: Mmomensohn-Santos TM, Russo ICP. Prática da audiologia clínica. 6ª Ed. São Paulo: Cortez. 2007; p.291-310.
9. Jerger J. Clinical experience with impedance audiometry. Arch. Otolaryng. Oct. 1970;92:311-24.
10. Jacobsen P, Hein HO, Suadicani P, Parving A, Gyntelberg F. Mixed solvent exposure and hearing impairment, an epidemiological study of 3284 men: the Copenhagen male study. J. Occup. Med. 1993;43(4):1804.
11. Fuente A, Mcpherson B. Central auditory processing effects induced by solvent exposure. Int. J. Occup. Med. Environ. Health. 2007;20(3):271-9.
12. Fuente A. Auditory damage associated with solvent exposure: evidence from a cross-sectional study. PhD Thesis, Hong Kong: University of Hong Kong, 2008.
13. Amâncio MATM. Centro de Referência em Saúde do Trabalhador (CEREST). A rede de atenção à saúde e acolhimento dos trabalhadores expostos a solventes. HISTÓRICO - "PROJETO FRENTISTA". CEREST / Campinas – SP. 2009.
14. Niklasson M. Audiological disturbances caused by long-term exposure to industrial solvents. Relation to the diagnosis of toxic encephalopathy. Scand Audiol. 1998;27(3):131-6.
15. Fuente A, Mcpherson B, Munoz V, Espina JB. Assessment of central auditory processing in a group of workers exposed to solvents. Acta Otolaryngol. 2006;126(11):88-94.
16. Sliwinska-Kowalska M, Zamyslowska-Szmytke E, Szymczak W, Kotylo P, Fiszer M, Wesolowsky W, et al. Exacerbation of noise-induced hearing loss by co-exposure to workplace chemicals. Environmental Toxicology and Pharmacology. 2005;19(3):547-53.
17. Cardoso PCM, Viana KS, Oliveira JS, Silva IMC. Audição em trabalhadores de manutenção de aeronaves. Revista do Centro de Ensino Superior Unificado de Brasília. 2004;1(4):215-32.
18. Bernardi APA. Exposição ocupacional a ruído e solventes e alterações auditivas periféricas e centrais. Tese (Doutorado em Saúde Pública): Faculdade de Saúde Pública, Universidade de São Paulo. São Paulo, 2007.
19. Botelho CT, Paz APML, Gonçalves AM, Frota S. Estudo comparativo de exames audiométricos de metalúrgicos expostos a ruído e ruído associado a produtos químicos. Rev. Bras. Otorrinolaringol. 2009;75(1):51-7.
20. Chang S, Chen CJ, Lien CH, Sung FC. Hearing loss in workers exposed to toluene and noise. Environ. Health Perspect. 2006;114(8):1283-6.
21. Kim J, Park H, Ha E, Jung T, Paik N, Yang S. Combined effects of noise and mixed solvents exposure on the hearing function among workers in the aviation industry. Industrial Health. 2005;43:567-73.
22. Fernandes T, Souza MT. Efeitos auditivos em trabalhadores expostos a ruído e produtos químicos. Rev. CEFAC. 2006;8(2):235-9.
23. Sliwinska-Kowalska M, Zamyslowska-Szmytke E, Szymczak W, Kotylo P, Fiszer M, Wesolowsky W, et al. Effects of coexposure to noise and mixture of organic solvents on hearing in dockyard workers. J. Occup. Environ. Med. 2004;46(1):30-8.
24. Hoet P, Lison D. Ototoxicity of toluene and styrene: state of current knowledge. Crit. Rev. Toxicol. 2008;38:127-70.
25. Morioka I, Miyai N, Yamamoto H, Miyashita K. Evaluation of combined effect of organic solvents and noise by the upper limit of hearing. Ind. Health. 2000;38:252-7.
26. Fuente A, Slade MD, Taylor T, Morata TC, Keith RW, Sparer J, Rabinowitz PM. Peripheral and central auditory dysfunction induced by occupational exposure to organic solvents. JOEM. 2009;51(10):1202-11.
27. Musiek FE, Baran JA, Pinheiro ML. Neuroaudiology: Case Studies. San Diego: Singular, 1994.
28. Gopal KV. Audiological findings in individuals exposed to organic solvents: Case studies. Noise Health. 2008;10(40):74-82.
Submitted date:
22/11/2011
Accepted date:
05/03/2012
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