Abstract
Analyze the slope, latency and amplitude values of the waveforms V, A, C, D, E, F and O from Frequency-following Response (FFR) with speech stimulus in normal-hearing adults based on a recent international reference study. Eleven normal-hearing adults aged 18-30 years, without hearing complaints, were evaluated in this study using an Intelligent Hearing Systems device. The speech stimulus /da/ was presented to the right ear via insertion phone and the responses were captured by electrodes placed on the vertex, right mastoid bone, and forehead (ground). The descriptive latency values of the components were V 6.50, A 7.87, C 17.74, D 22.77, E 32.07, F 40.03 and O 48.07 ms. The mean amplitude measures of the waves were V 0.17, A -0.12, C -0.14, D -0.14, E -0.20, F -0.22 and O -0.14 µV. The mean slope value was 0.23. Comparison with an international study, Krizman et al. (2012), showed that most of the results are within positive and negative standard deviation values for the assessed age group for slope, latency and amplitude. The electrophysiological measures obtained from Frequency-following Response using the speech stimulus / da/ in normal-hearing adults without hearing complaints showed slope, latency and amplitude values of all FFR components within the normality standard described in the international literature.
Highlights
Analyze the slope, latency and amplitude values of the waveforms V, A, C, D, E, F and O from Frequency-following Response (FFR) with speech stimulus in normal-hearing adults based on a recent international reference study
These components were observed in 100% of the sample
The protocol used suggests that the examination be interrupted and that the electrodes be checked and repositioned if there is a number of artifacts larger than 20% of the stimulus (600/3000 sweeps), no case of presence of artifacts >20% was observed in the present study
Summary
Latency and amplitude values of the waveforms V, A, C, D, E, F and O from Frequency-following Response (FFR) with speech stimulus in normal-hearing adults based on a recent international reference study. Conclusion: The electrophysiological measures obtained from Frequency-following Response using the speech stimulus / da/ in normal-hearing adults without hearing complaints showed slope, latency and amplitude values of all FFR components within the normality standard described in the international literature. Conclusão: A resposta eletrofisiológica da Frequency Following Response, utilizando o estímulo de fala /da/, em adultos com audição normal e sem queixas auditivas, apresentou valores de slope e de latência e amplitude de todos os componentes dentro do padrão de normalidade apresentado pela literatura internacional. Study conducted at the Curso de Fonoaudiologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo – FCMSCSP - São Paulo (SP), Brasil. 1 Curso de Fonoaudiologia da Faculdade de Medicina, Faculdade de Ciências Médicas da Santa Casa de São
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