面神经逆行诱发电位的临床初探

Clinical exploration of facial nerve antidromic evoked potentials

目的探讨人体面神经逆行诱发电位（ＦＮＡＥＰ）的特点及其临床应用价值。方法采用极性交替的恒流刺激电信号经皮电刺激茎乳孔面神经，在正常人鼓膜（１５耳）及鼓室（９耳）记录ＦＮＡＥＰ。结果都能记录到ＦＮＡＥＰ，且其波幅随刺激强度的增大而增大，当刺激强度为阈强度的２倍时，ＦＮＡＥＰ达到最大；急性颞骨内面瘫后ＦＮＡＥＰ波幅减小、峰潜伏期延长，并随面瘫的好转，ＦＮＡＥＰ逐渐恢复正常。结论ＦＮＡＥＰ可作为早期诊断急性颞骨内面瘫的一种新方法。

Objectives To investigate the feature and the diagnostic value of the facial nerve antidromic evoked potentials(FNAEP) Methods With transcutaneous alternative polarity stimulus of the facial nerve at stylomastoid foramen(SMF) in normal human beings and a patient with acute facial paralysis Results FNAEP could be recorded with an electrode at the tympanic membrane(15 ears) and the tympanum(9 ears) Its amplitude was increased with increasing intensity of the stimulus And the amplitude if FNAEP approached a maximal value at two times threshold The patient with acute facial paralysis showed the declined amplitude and the prolonged latency of FNAEP FNAEP gradually returned to normal with clinical recovery of the facial paralysis Conclusions FNAEP might be used as an earlier diagnostic method for acute intratemporal facial paralysis