人工耳蜗植入者电听性脑干反应测试

Auditory Evaluation with Electrically Evoked Auditory Brainstem Responses (EABR) in Cochlear Implant Users

目的 通过对人工耳蜗植入者的电听性脑干反应 (electricallyevokedauditorybrainstemresponses,EABR)检测 ,探讨术后患者的电听觉传导通路的功能状态和EABR阈值。方法 对 6例人工耳蜗植入患者术后进行EABR检测。分别选取近耳蜗底转、中部和近蜗顶部三个固定部位的蜗内电极作为刺激电极 ,进行EABR记录 ,将所测EABR阈值与主观阈值和NRT(neuralresponsetelemetry)阈值进行比较。结果 6例患者 ,用 175电流级 (currentlevel)的刺激强度 ,每一部位都可记录到清晰易识别、重复性良好的EABR波形 ,在耳蜗底转 ,中部和蜗顶部电极测得EABR波Ⅲ平均潜伏期分别为 1.83± 0 .19、1.80± 0 .18、1.6 8± 0 .2 3ms ,波Ⅴ平均潜伏期分别为 3.90± 0 .16、3.74±0 .18、3.6 2± 0 .2 4ms;测得EABR平均阈值分别为 16 5 .33± 7.6 6、16 2 .6 7± 7.2 8、15 3.33± 8.0 2电流级。

Objective Electrically evoked auditory brainstem responses (EABR) were recorded in multichannel cochlear implant (CI) users to determine the function of auditory conducting system and to acquire the objective hearing threshold of responses.Methods Electrically evoked auditory brainstem responses (EABR) were recorded in 6 deaf patients who were experienced users of a Nucleus multichannel cochlear implant (CI). Electrodes in sustained location which involved basal, middle and apical part of the cochlear were selected as the stimulated electrodes, for each electrode position EABR were recorded , and threshold of EABR were compared with perceptual threshold (T-level) and threshold of NRT.Results All studied electrode position in all 6 patients had clearly identifiable waveform with good repeatability in 175 current level. With the electrodes in basal, middle and apical part of the cochlear were stimulated, the average latency of EABR waveⅢ were 1.83±0.19 ms,1.80±0.18 ms,1.68±0.23 ms respectively, while waveⅤ were 3.90±0.16 ms,3.74±0.18 ms,3.62±0.24 ms; the average threshold of EABR were 165.33±7.66,162.67±7.28,153.33±8.02 current level respectively.Conclusion ①.EABR is a reliable technique in evaluating the function of auditory conducting system in cochlear implant users. ②. EABR is an objective and accurate technique in acquiring the hearing threshold of responses after cochlear implant.