听神经病/听觉失同步化患者的交替短声诱发耳蜗电图

目的 分析听神经病/听觉失同步化(auditory neuropathy/auditory desynchronization.AN/AD)患者交替短声诱发的耳蜗电图特征,探索耳蜗电图在确定听神经病,听觉失同步化病变部位时的应用价值.方法 AN/AD组患者14人,共28耳,所有患者听性脑干反应(ABR)波形缺失或严重分化异常,耳声发射正常:听力正常对照组28人,共35耳.对两组受试者行耳蜗电图(ECochG)检查,使用交替极性短声作为刺激信号.观测AN/AD组和对照组ECochG的波形,并对比:(1)CAP-N1(复合动作电位N1波)的峰潜伏期;(2)-SP(总和电位)和CAP绝对幅度;(3)-SP和CAP幅度比值;(4)CAP反应周值.结果 对照组全部引出分化良好的CAP和-SP.AN/AD组ECochG波形可分为四种类型:(1)可同时引出-SP、CAP,占60.7%;(2)仅有-SP引出,未见CAP引出,占10.7%;(3)仅有CAP引出,占3.6%;(4)-SP、CAP均未引出,占25%.AN/AD组与对照组的CAP潜伏期(P=0.052)无统计学差异;ANIAD组的CAP绝对幅度低于对照组(P<0.001),-SP(P=0.045)绝对幅度、-SP/CAP幅度比(P<0.001)和阈值(P<0.001)高于对照组.结论 在ABR引不出或分化较差时,耳蜗电图是一种比较可靠的评估外周听觉神经功能的方法,在AN/AD的诊断中能够发挥重要作用.

Alternating clicks-evoked ECochG in auditory neuropathy/auditory desynchronization

Objective To determine values of ECochG in identifying disorder locations in auditory neuropathy(AN) / auditory desynchronization(AD) via examining characteristics of alternating click evoked ECochG in individual with AN/AD.Methods Alternating clicks-evoked ECochG was recorded in 14 patients(28 ears) with AN/AD,who had absent or abnormal ABRs and normal OAEs,and in 28 normal hearing subjects(35 ear).CAP-N1 latency,-SP and CAP amplitudes,-SP/CAP amplitude ratio,and CAP threshold were measured and compared be...