A telemetria de respostas neurais no sistema de implante coclear multicanal nucleus 24: revisão da literatura

Ferrari, Déborah Viviane; Sameshima, Koichi; Filho, Orozimbo Alves Costa; Bevilácqua, Maria Cecília

doi:10.1590/s0034-72992004000100019

Cited by 17 publications

(15 citation statements)

References 12 publications

(21 reference statements)

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“…Therefore, NRT is a technique that allows ECAP to be measured directly in implanted patients during and after surgery with greater sensitivity, as it can be done in more than 80% of the assessed individuals. NRT is a valuable tool and can be used to confirm the integrity of the internal device, objectively determine which electrodes can be included in a map, define the best stimulation frequencies and speech encoding strategies, estimate T levels to measure the current levels to induce hearing sensation, and estimate C levels -the maximum sensation intensity accepted by patients, a clinically important variable 15 . No differences were observed on neural response telemetry between implants placed in the tympanic scale via cochleostomy or the round window.…”

Section: Discussionmentioning

confidence: 99%

Comparação da telemetria de resposta neural via cocleostomia ou via janela redonda no implante coclear

Hamerschmidt¹,

Schuch²,

Rezende³

et al. 2012

Braz. j. otorhinolaryngol.

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There are two techniques for cochlear implant (CI) electrode placement: cochleostomy and the round window (RW) approach.Objective: This study aims to compare neural response telemetry (NRT) results immediately after surgery to check for possible differences on auditory nerve stimulation between these two techniques. Materials and Methods:This is a prospective cross-sectional study. Twenty-three patients were enrolled. Six patients underwent surgery by cochleostomy and 17 had it through the RW approach.Results: Mean charge units (MCU) for high frequency sounds: patients submitted to the RW approach had a mean value of 190.4 (± 29.2) while cochleostomy patients averaged 187.8 (± 32.7); p = 0.71. MCU for mid frequency sounds: patients submitted to the RW approach had a mean value of 192.5 (± 22) while cochleostomy patients averaged 178.5 (± 18.5); p = 0.23. MCU for low frequency sounds: patients submitted to the RW approach had a mean value of 183.3 (± 25) while cochleostomy patients averaged 163.8 (± 19.3); p = 0.19. Conclusion:This study showed no differences in the action potential of the distal portion of the auditory nerve in patients with multichannel cochlear implants submitted to surgery by cochleostomy or through the RW approach, using the implant itself to generate stimuli and record responses. Both techniques equally stimulate the cochlear nerve. Therefore, the choice of approach can be made based on the surgeon's own preference and experience. Braz J Otorhinolaryngol. 2012;78(4):71-5. ORIGINAL ARTICLE BJORL

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Section: Discussionmentioning

confidence: 99%

Comparação da telemetria de resposta neural via cocleostomia ou via janela redonda no implante coclear

Hamerschmidt¹,

Schuch²,

Rezende³

et al. 2012

Braz. j. otorhinolaryngol.

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“…Moreover, the fact that we are using surface electrodes in electrophysiological tests makes it easier to capture such reflex, having seen that this electrode can be easily contaminated by artifacts of muscle activity or by external electrical interference 22 . According to the literature studied, one of the ways to prevent the recording of this reflex would be to place the electrodes on a non-cephalic region of the patient 10 .…”

Section: Respectively)mentioning

confidence: 99%

Post-auricular muscle reflex in the Middle Latency Evoked Auditory Response

Matas¹,

Neves²,

Carvalho³

et al. 2009

Braz. j. otorhinolaryngol. (Impr.)

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The Middle Latency Auditory Evoked Response may be influenced by the post-auricular muscle reflex which occurs at the same latency of this potential. Aim: to evaluate the muscle reflex influence on the middle latency response, identifying the most appropriate place for response recording. Materials and Methods: Prospective study in which 40 normal hearing individuals, ranging in age from 18 to 40 years old, were assessed by Middle Latency Response with electrodes placed first on the mastoids, and then on the earlobes. Results: significant statistical differences were seen between the values found with electrodes placed on the mastoids and on the earlobes concerning the Na-Pa amplitude in C3/A1, C3/A2 and C4/A2, concerning the Na wave latency in C3/A2 and C4/A2, and concerning the Pa wave latency in C3/A1 and C3/A2. We found a higher occurrence of the post-auricular reflex when the electrode was placed on the mastoids, in all studied modalities. Conclusion: there was post-auricular muscle reflex interference upon the Middle Latency Response obtained when the electrodes were placed on the mastoid, and the most efficient electrode disposition in order to capture and to register more accurately this potential was on the earlobe.

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“…The variation in the IPI allows for identification of the time that neural fibers remain in the refractory period (2).…”

Section: Introductionmentioning

confidence: 99%

Implante coclear: correlação da recuperação neural, privação auditiva e etiologia

Kutscher

Goffi-Gómez

Befi-Lopes

et al. 2010

Pró-Fono R. Atual. Cient.

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TEMA: a Função de Recuperação do Nervo Auditivo (REC) pode ser extraída do potencial de ação das fibras neurais - ECAP (Eletrically Evoked Compound Action Potential). O ECAP pode ser influenciado pela estimulação recebida pelo nervo e pela etiologia de uma perda auditiva e, consequentemente, afetar a REC. OBJETIVO: verificar se há correlação entre REC e os fatores: etiologia, tempo de surdez e tempo de uso do AASI antes do Implante Coclear (IC). MÉTODO: estudo retrospectivo transversal. Foram coletados dados sobre etiologia, tempo de surdez, tempo de uso do Aparelho de Amplificação Sonora Individual (AASI) e REC de 50 indivíduos, 26 crianças e 24 adultos, submetidos à cirurgia de IC e usuários do dispositivo multicanal Nucleus®24. As medidas da função de recuperação do nervo auditivo foram calculadas e os pacientes foram divididos em grupos (GI: recuperação rápida, GII: recuperação intermediária e GIII: recuperação lenta) para posterior análise de relação com os demais dados coletados. RESULTADOS: a análise dos dados não mostrou correlação estatisticamente significante entre a recuperação e os aspectos pré-cirúrgicos estudados. Entretanto, foi possível observar maior concentração de ambos, crianças e adultos, nas REC intermediárias. GI não agrupou indivíduos com surdez de etiologias infecciosas, tais como a meningite, rubéola e citomegalovírus. A média de REC apresentou-se mais lenta para as etiologias infecciosas, tanto para o grupo de crianças, como para o grupo de adultos. CONCLUSÃO: não houve correlação estatisticamente significante entre função de recuperação do nervo auditivo e os fatores: etiologia, tempo de surdez e tempo de uso do AASI antes do IC.

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A telemetria de respostas neurais no sistema de implante coclear multicanal nucleus 24: revisão da literatura

Cited by 17 publications

References 12 publications

Comparação da telemetria de resposta neural via cocleostomia ou via janela redonda no implante coclear

Comparação da telemetria de resposta neural via cocleostomia ou via janela redonda no implante coclear

Post-auricular muscle reflex in the Middle Latency Evoked Auditory Response

Implante coclear: correlação da recuperação neural, privação auditiva e etiologia

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