de Lima Janaina Patricio, de Freitas Alvarenga Kátia, Foelkel Tábata Pierini, Monteiro Camila Zotelli, Agostinho Raquel Sampaio
Speech therapist.
Doctor, Livre-Docente (habilitation) professor.
Braz J Otorhinolaryngol. 2008 Sep-Oct;74(5):725-730. doi: 10.1016/S1808-8694(15)31383-5.
Brainstem 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.
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.
Clinical.
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.
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.
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.
脑干听觉诱发电位被认为是外源性电位，也就是说，所获得的反应高度依赖于用于诱发它们的刺激特性。
使用插入式耳道耳机，研究不同强度下短声刺激极性在脑干听觉诱发电位测听（BERA）研究中的影响。
临床研究。
33名年龄在18至28岁之间、无听力改变的个体接受了BERA测试，采用不同强度的短声刺激，包括疏波、密波和交替极性。
与其他极性相比，V波的绝对潜伏期在疏波极性时较低，在80 dBnHL时，疏波与其他极性在峰间潜伏期III-V和I-V方面存在显著差异。在80 dBnHL时，密波和交替极性在绝对潜伏期和峰间潜伏期方面具有高度相关性。
短声刺激极性对BERA有显著影响。在常规使用TDH 39耳机且采用交替极性的情况下，由于本插入式耳机研究中发现的潜伏期具有更高的相似性，我们建议密波极性更适合用于标准化比较目的。
