Roland P S, Yellin M W, Meyerhoff W L, Frank T
Department of Otolaryngology, University of Texas Southwestern Medical Center at Dallas, USA.
Am J Otol. 1995 Jul;16(4):444-50.
Electrocochleography (ECoG) has become a mainstay in the diagnostic armamentarium used by otolaryngologists and audiologists in the evaluation of patients suffering auditory and vestibular symptoms. Controversy exists, however, regarding the relative accuracy of ECoG when recorded with a non-invasive external auditory canal (EAC) electrode as compared to that recorded using a transtympanic electrode. In an effort to resolve this controversy, 19 healthy volunteers (37 ears) with no history of otologic disease or symptoms and a normal screening pure-tone audiogram were studied. For each volunteer, a transtympanic electrode was placed on the cochlear promontory bilaterally under iontophoretic anesthesia followed by the immediate placement of an EAC TIPtrode (Etymotic Research Laboratory, Elk Grove Village, Illinois). Signals from both the transtympanic electrode and the TIPtrode were recorded simultaneously following click stimulus using the Nicolet CA 1,000. Preliminary analysis of these recordings identify no significant difference in summating potential/action potential ratios between EAC and transtympanic electrodes in this normal subject population.
耳蜗电图（ECoG）已成为耳鼻喉科医生和听力学家在评估有听觉和前庭症状患者时诊断工具中的一项主要手段。然而，与经鼓膜电极记录的情况相比，使用非侵入性外耳道（EAC）电极记录时ECoG的相对准确性存在争议。为了解决这一争议，对19名无耳科疾病或症状病史且纯音听力筛查正常的健康志愿者（37耳）进行了研究。对于每位志愿者，在离子导入麻醉下双侧将经鼓膜电极置于蜗窗岬，随后立即放置一个EAC TIPtrode（伊顿研究实验室，伊利诺伊州埃尔克格罗夫村）。使用Nicolet CA 1000在短声刺激后同时记录经鼓膜电极和TIPtrode的信号。对这些记录的初步分析表明，在这一正常受试者群体中，EAC电极和经鼓膜电极之间的总和电位/动作电位比值没有显著差异。
