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作者等报告对半面痉挛(HFS)微血管减压术中进行面部肌电图(EMG)监护,其基本方法按照Mφller及Jannetta所提出的。刺激针电极刺入面神经的下颌缘支和颞支的皮内,记录针电极插入同测的颏肌和眼轮匝肌,方波持续刺激100μs,电流3～5mA,刺激率5.1/s,用两个电极(相距1cm)行双向刺激及双极记录,记录电极距刺激电极约4cm。记录整个减压术的全过程。共观察11例,1例因仪器记录不满意;2例呈正常反应;8例显示异常肌电位。逆向刺激与异常反应间潜伏期近13ms。2例于减压前异常反应消失:1例发生在硬脑膜切开之后,1例于小脑轻度收缩之后。1例可见
The authors report the facial electromyogram (EMG) monitoring of hemifacial spasm (HFS) microvascular decompression, the basic method according to Mφller and Jannetta proposed. The stimulation needle electrode pierced the facial nerve of the mandibular marginal branch and temporal branch of the skin, the recording needle electrode inserted into the same measurement of the chin muscle and orbicularis muscle, square wave continuous stimulation 100μs, current 3 ~ 5mA, stimulation rate 5.1 / s, with Bidirectional stimulation and bipolar recording were performed at two electrodes (1 cm apart), and the recording electrode was about 4 cm from the stimulation electrode. Record the whole process of decompression surgery. A total of 11 cases were observed, 1 case was not satisfied with the instrument records; 2 cases showed normal reaction; 8 cases showed abnormal myoelectricity. Reverse stimulation and abnormal reaction between the incubation period of nearly 13ms. Anomalous reactions disappeared in 2 cases before decompression: one case occurred after dural incision, and one case had mild cerebellar contractions. 1 case can be seen