Os efeitos da polaridade do estímulo nos Potenciais Evocados Auditivos de Tronco Encefálico

Abstract

Brai nstem Auditory Evoked Potentials are considered exogenous potentials, that is, the responses obtained are highly dependent upon the characteristic of the stimulus used to evoke them. Aim: To investigate the influence of the click stimulus polarity in the study of Brainstem Evoked Response Audiometry (BERA) at different intensities, using insertion-canal earphones. Type of Study: Clinical. Materials and methods: 33 individuals, aged between 18 and 28, with no auditory alteration were submitted to BERA testing, with click stimulus on the rarefaction, condensation and alternate polarities, in different intensities. Results: The absolute latencies of the V wave proved to be lower in the rarefaction polarity when compared to the others and, at 80 dBnHL, there was a significant difference between rarefaction and the other polarities for interpeak latencies III-V and I-V. There was a high correlation between the condensation and alternating polarities for absolute and interpeak latencies at 80 dBnHL. Conclusion: the click stimulus polarity has a significant influence on BERA. In the routine use of the TDH 39 earphone, with alternating polarity, we suggest that condensation polarity is more adequate for standardized comparison purposes, due to the higher similarity of the latencies found in this insertion earphone study.

Efeito da infecção por COVID-19 na via auditiva até tronco encefálico

“…Foram analisados os valores das latências absolutas das ondas I, III e V, bem como das latências interpicos I -III, III -V e I -V de ambas as orelhas. Os valores de referência de normalidade adotado para as ondas I, III e V foram, respectivamente: 1,68±,1245; 3,75±,2104; 5,56±,2673 e para as latências interpicos I -III, III-V e I-V foram, respectivamente: 2,06±,2131; 1,81±,2278; 3,87±,2675 14 .…”

Potenciais evocados auditivos de tronco encefálico em adultos em posição de repouso e em movimentação

“…Thus, the electrophysiological records in the Integrity system were compatible with those of a The time of examination in movement is higher than at rest (p < 0.001), in both ears gold standard equipment available in the market, with respect to the average variable of the absolute latencies of the I, III, and V waves and the interpeak latencies I-III, III-V, and IV. According to the literature (24,25,26) the average values of the latencies of wave I range between 1.50 and 1.68 ms, those of wave III range between 3.50 and 3.80 ms, and those of wave V range between 5.50 and 5.64.…”