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Improved recording techniques of antidromic facial nerve response for outpatient clinical use (letter)

机译：用于门诊临床的改进的抗面部神经反应记录技术（字母）

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OBJECTIVE: The purpose of this study was to obtain an analyzable wave of the antidromic facial nerve response (ADFNR) without interference of the compound muscle action potential (CMAP) at the outpatient clinic setting. BACKGROUND: To evaluate intratemporal facial nerve function with the ADFNR, it is necessary to analyze the waveform of propagating nerve impulses in the temporal bone. However, this small nerve response is easily disturbed by the CMAP, which is simultaneously evoked by electrical stimulation. METHODS: The ADFNR was recorded at the entrance of the external ear canal and simultaneously at the anulus tympanicus. Subtraction between the responses evoked at both sites was performed to eliminate the CMAP. RESULTS: The ADFNR was recorded after subtraction of the response recorded at the entrance of the external ear canal from that at the anulus tympanicus. The normal ADFNR had a triphasic waveform. With the placement of the reference electrode at the entrance of the external ear canal, the responses were similar to the subtracted responses. CONCLUSIONS: We recommend the subtraction method and placement of the reference electrode at the entrance of the external auditory canal to record an analyzable ADFNR and to simplify the recording techniques.
机译：目的：本研究的目的是在门诊就诊环境下获得可分析的波状面神经反应（ADFNR），而不会干扰复合肌肉动作电位（CMAP）。背景：为了评估ADFNR的颞内面神经功能，有必要分析颞骨中传播的神经冲动的波形。但是，这种小的神经反应很容易受到CMAP的干扰，而CMAP会同时被电刺激诱发。方法：ADFNR记录在外耳道的入口，同时记录在鼓室。在两个部位引起的反应之间进行减法以消除CMAP。结果：在减去外耳道入口记录的反应后，从鼓膜肛门的记录中减去了ADFNR。正常的ADFNR具有三相波形。将参考电极放置在外耳道的入口处，其响应与减去的响应相似。结论：我们建议在外耳道入口处使用减法和参考电极放置，以记录可分析的ADFNR并简化记录技术。

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