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听力学及言语疾病杂志JOURNAL OF AUDIOLOGY AND SPEECH PATHOLOGY
2002 Vol.10 No.3 P.164-167
强声暴露后豚鼠耳蜗外毛细胞电反应特性的在体研究
Response Characteristics of the Guinea-pig Cochlea Outer Hair Cells and Its Alteration Induced by Intense Tones: Intracellular studies
武文明
姜泗长
顾瑞
杨伟炎
摘 要:目的探讨强声暴露后豚鼠耳蜗毛细胞感受器电位(receptor potential,RP)变化和复合神经动作电位(compound action potential,CAP)的关系.方法在成功建立豚鼠耳蜗毛细胞电反应记录方法后,将同一强度、不同频率的强声施加于受试耳,观察外毛细胞频率响应和RP及圆窗CAP的变化.结果外毛细胞在不同频率强声暴露后,特征频率(characteristic frequency,CF)的RP反应幅度减小,刺激声强度与RP的I-O曲线线性增加,CF的频率选择性下降.频率低于CF的强声较高于CF的强声更易引起CF的RP 下降.重复暴露有累加效应.同步记录的圆窗CAP未见阈移.结论低频强声引起耳蜗外毛细胞RP损伤也遵循半倍频程漂移规律.损伤机制可能与外毛细胞静纤毛及盖膜受累有关.
关键词:外毛细胞 生理 强声 感受器电位
文章编号:1006-7299(2002)03-0164-04
作者简介:武文明(1962-),男,内蒙人,副主任医师,副教授,主要从事耳蜗电生理研究,耳、耳神经外科及头颈肿瘤临床研究
作者单位:武文明(解放军总医院耳鼻咽喉科,解放军总医院耳鼻咽喉科研究所,北京,100853)
姜泗长(解放军总医院耳鼻咽喉科,解放军总医院耳鼻咽喉科研究所,北京,100853)
顾瑞(解放军总医院耳鼻咽喉科,解放军总医院耳鼻咽喉科研究所,北京,100853)
杨伟炎(解放军总医院耳鼻咽喉科,解放军总医院耳鼻咽喉科研究所,北京,100853)
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