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Arquivos Internacionais de Otorrinolaringologia 2010; 14(04): 410-416
DOI: 10.1590/S1809-48722010000400005
Original Article
Thieme Publicações Ltda Rio de Janeiro, Brazil

Vestibular Evoked Myogenic Potential: We Propose a New Instrument

Potencial Miogênico Evocado Vestibular: Proposição de um Novo Instrumento
Aline Cabral de Oliveira
*   PhD in Medical Sciences, Faculty of Medicine of Ribeirao Preto - USP. Professor, Federal University of Sergipe.
,
José Fernando Colafêmina
**   Doctor of Medical Sciences, Otorhinolaryngology. Full Professor, Faculty of Medicine of Ribeirao Preto - USP.
,
Pedro de Lemos Menezes
***   Ph.D. in Applied Physics in Medicine and Biology. Adjunct Professor, State University of Health Sciences of Alagoas.
› Author Affiliations
Further Information

Publication History

11 July 2010

22 August 2010

Publication Date:
12 February 2014 (online)

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Summary

Introduction: Currently, there is still no specific instrument for assessment of vestibular evoked myogenic potentials, with the same performed by a device designed to capture auditory evoked potentials available in the market. Thus, the functions of amplification, filtering, stimulation, window capture, rejection of artifacts and features of averaging, as well as its management software, are much to be desired for the new role assigned to it.

Objective: To compare latencies and amplitudes of components p13 and n23, and the indices of asymmetry between a devices considered the gold standard (EP25), adapted to record the potential and the new equipment developed.

Method: An experimental study with 11 normal hearing. From the tone-burst sound stimuli of 10 ms, frequency of 500 Hz with intensity 90 dBNAn, evoked myogenic potentials were recorded with 80 ms windows.

Results: You can see no significant differences when comparing the two instruments regarding the parameters of latency and amplitude, except for the latency of n23, with p = 0.005. The value of asymmetry index inter-p13-n23 peak for the new unit (20.1%) was significantly lower than that found for the EP25 (30.5%), with p less than 0.01.

Conclusion: Thus, we conclude that there are no differences for the latencies and amplitudes of VEMP between the EP25 and the new device developed by presenting the latter, closer to the values reported in literature and a lower index of asymmetry of amplitude between p13-n23 peak. Study form: Prospective clinical and experimental. Identifier: NCT01132105.

Resumo

Introdução: Atualmente, ainda não existe um instrumento específico para a avaliação dos potencias miogênicos evocados vestibulares, sendo a mesma realizada por meio de um equipamento desenvolvido para a captação de potenciais evocados auditivos, disponível no mercado. Assim, as funções de amplificação, filtragem, estimulação, janela de captação, rejeição de artefatos e características de promediação, bem como o próprio software de gerenciamento, ficam muito a desejar para a nova função que lhe é atribuída.

Objetivo: Comparar latências e amplitudes das componentes p13 e n23, e os índices de assimetria, entre um equipamento considerado padrão-ouro (EP25), adaptado para o registro deste potencial, e o novo equipamento desenvolvido.

Método: Estudo experimental com 11 ouvintes normais. A partir de estímulos sonoros tone-burst de 10 ms, frequência de 500 Hz, com intensidade de 90 dBNAn, foram registrados potenciais miogênicos evocados com janelas de 80 ms.

Resultados: Pode-se constatar ausência de diferenças significativas, quando comparados os dois instrumentos, quanto aos parâmetros de latência e amplitude, exceto para a latência de n23, com valor de p = 0,005. O valor do índice de assimetria inter-pico p13-n23, para o novo aparelho (20,1%), foi significativamente menor que o encontrado para o EP25 (30,5%), com p menor que 0,01.

Conclusão: Desta forma, conclui-se, que não existem diferenças para as latências e amplitudes do VEMP entre o EP25 e o novo dispositivo desenvolvido, apresentando, este último, maior proximidade com os valores descritos na literatura e menor índice de assimetria da amplitude inter-pico p13-n23. Forma de estudo: prospectivo, clínico e experimental. Identifier: NCT01132105

Keywords

evoked potentials - vestibule - labyrinth - diagnosis

Palavras-chave

potenciais evocados - vestíbulo do labirinto - diagnóstico
 

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