Classification research of abnormal muscle response waveforms in hemifacial spasm
Kang Zhichen
Yang Qingxiao
Duan Xiaoqin
Chen Yan
Zhang Haina
Wang Huan
Qu Fuling
Guo Lixin
Liu Zhongliang
Guan Wenming
Abstract：Objective To study the classification of the abnormal muscle response (AMR) waveform in hemifacial spasm, and analyze the morphological characters and variety of AMR. Methods Clinical data of 56 patients with hemifacial spasm undergoing microvacular decompression were analyzed retrospectively. AMR examination was performed preoperatively. Muscle contraction named AMR was induced by stimulating the facial nerve branches, then, evoked potential waveforms were recorded. Different waveform morphologies were analyzed and the compression situation of the facial nerve was judged by comparing with uninjured side. Results AMR waveforms were showed in hemifacial spasm patients with microvascular compression. The classification of AMR waveform was as follows:typical waveform in 34 patients, time-limit delay type waveform in 6, scattering type waveform in 8, discontinuity scattering type waveform in 4, incremental incubation period following the stimulation intensity type waveform in 2 and diversity transmission type waveform in 2. Conclusions Preoperative AMR including many kinds of waveforms is helpful for the diagnosis of hemifacial spasm after microvascular compression, and can be used as one of indexes for judging surgery.
Keywords：hemifacial spasmabnormal muscle responsewaveform morphology
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 101-103 )