Efeito da estimulação acústica contralateral nas medidas temporais das emissões otoacústicas
Effect of contralateral acoustic stimulation in temporal measures of otoacoustic emissions
Vanessa Nogueira Leme; Renata Mota Mamede Carvalho
Resumo
Objetivo: comparar o nível de resposta e o tempo de latência das emissões otoacústicas sem e com apresentação de ruído contralateral.
Métodos: foram avaliados 30 indivíduos, com idade entre 18 e 30 anos, sem queixas auditivas e com presença de emissões otoacústicas por produto de distorção. Analisou-se o nível de resposta e latência das emissões otoacústicas por meio do programa Latencygram, com e sem apresentação de ruído contralateral tipo "White noise".
Resultados: houve diminuição significante nos níveis de resposta das emissões otoacústicas com apresentação de ruído contralateral, confirmando o efeito de supressão relacionado com a ação do sistema eferente; contudo, não houve diferença significante nos valores de latência das emissões otoacústicas.
Conclusão: o sistema eferente atua apenas na modulação dos níveis de resposta das emissões otoacústicas, contudo não interfere nas medidas temporais das mesmas.
Palavras-chave
Abstract
Purpose: compare the otoacoustic emissions response level and latency in two situations: with and without contralateral competitive noise.
Methods: thirty individuals between eighteen and thirty-year-old, with no auditory complaints and presence of otoacoustic distortion product emissions were evaluated. The latency and the response level of otoacoustic emissions was evaluated using the Latencygram program. The test was performed in two different situations: with and without contralateral competitive white noise.
Results: the results demonstrated a significant reduction in otoacoustic emissions response levels with contralateral noise, proving the otoacoustic suppression effect associated with olivocochlear efferent system action. However, there was no significant difference in otoacoustic emissions latency.
Conclusion: the efferent system may act only in otoacoustic emissions response level modulation but it does not interfere in otoacoustic emissions latency.
Keywords
Referencias
1. Abissamra RGC. Latências das emissões otoacústicas da orelha normal de portadores de perda auditiva sensorioneural unilateral. [dissertação] São Paulo (SP): Universidade de São Paulo; 2001.
2. Neely ST, Johnson TA, Gorga MP. Distortion-product otoacoustic emission measured with continuously varying stimulus level. J Acoust Soc Am. 2005; 117(3Pt1):1248-59.
3. Shaffer LA, Withnell RH, Dhar S, Lilly DJ, Goodman SS, Harmon KM. Sources and mechanisms of DPOAE generation: implications for the prediction of auditory sensitivity. Ear Hear. 2003; 24(5):367-79.
4. Quiñonez RE, Crawford MR. Longitudinal distortion product otoacoustic emission (DPE) latency changes in preterms neonates. Acta Otolaryngol. 1998; 118(1):26-31.
5. Azevedo RF, Carvallo RMM. Medidas da latência das emissões otoacústicas - produto de distorção em neonatos. Rev Bras Otorrinolaringol. 2003; 69(5):691-5.
6. May BJ, Budelis J, Niparko JK. Behavioral studies of the olivocochlear efferent system: learning to listen in noise. Arch Otolaryngol Head Neck Surg. 2004; 130(5):660-4.
7. Guinan Junior JJ. Olivocochlear efferents: anatomy, physiology, function, and the measurement of efferent effects in humans. Ear Hear. 2006; 27(6):589-607.
8. Fávero ML, Sanchez TG, Nascimento AF, Bento RF. A função do trato olivococlear medial em indivíduos com zumbido. Arq Otorrinolaringol. 2003; 7(4):265-70.
9. Groff JA, Liberman MC. Modulation of cochlear afferent response by the lateral olivocochlear system: activation via electrical stimulation of the inferior colliculus. J Neurophysiol. 2003; 90(5):3178-200.
10. Muchnik C, Roth DA, Othman-Jebara R, Putter-Katz H, Shabtai EL, Hildesheimer M. Reduced medial olivocochlear bundle system function in children with auditory processing disorders. Audiol Neurootol. 2004; 9(2):107-14.
11. Mor R, Azevedo MF. Emissões otoacústicas e sistema olivococlear medial: pacientes com zumbido sem perda auditiva. Pró-Fono. 2005; 17(3):283-92.
12. Sanches SGG, Carvallo RM. Contralateral suppression of transient evoked otoacoustic emissions in children with auditory processing disorder. Audiol Neurootol. 2006; 11(6):366-72.
13. Durante AS, Carvalho RMM. Contralateral suppression of linear and nonlinear transient evoked otoacoustic emissions in neonates at risk for hearing loss. J Commun Disord. 2008; 41(1):70-83.
14. Kumar UA, Vanaja CS. Functioning of olivocochlear bundle and speech perception in noise. Ear Hear. 2004; 25(2):142-6.
15. Tadros SF, Frisina ST, Mapes F, Kim S, Frisina DR, Frisina RD. Loss of peripheral right-ear advantage in age-related hearing loss. Audiol Neurootol. 2005; 10(1):44-52.
16. Marques VV, Azevedo MF. Distortion product emission latency in normal hearing adults. Pró-Fono. 2004; 16(2):203-8.
17. Campos UP, Carvalho RMM. Latência das EOAPD em milissegundos e número de ondas. Rev Bras Otorrinolaringol. 2005; 71(6):784-90.
18. Basseto MCA, Chiari BM, Azevedo MF. Emissões otoacústicas evocadas transientes (EOAET): amplitude de resposta em recém-nascidos a termo e pré-termo. Rev Bras Otorrinolaringol. 2003; 69(1):84-92.
19. Bowman DM, Brown DK, Kimberley BP. An examination of gender differences in DPOAE phase delay measurements in normal-hearing human adults. Hear Res. 2000; 142(1-2):1-11.
20. Mahoney CF, Kemp DT. Distortion product otoacoustic emission delay measurement in human ears. J Acoust Soc Am. 1995; 97(6):3721-35.
21. Zhong N, Li Q, Guo Y. [Effects of selective attention and contralateral acoustic stimulation on latency of distortion product otoacoustic emissions]. Lin Chuang Er Bi Yan Hou Ke Za Zhi. 2001; 15(10):437-8.
22. Kong W, Yang Y, Zhang W. [Contralateral suppression of latency during distortion product otoacoustic emissions detection in guinea pigs]. Zhonghua Er Bi Yan Hou Ke Za Zhi. 2001; 36(4):271-4.
Submitted date:
05/02/2007
Accepted date:
04/06/2008
Facebook
Twitter
LinkedIn
Mendeley
Email