Significance of abnormal muscle response under different stimulation intensity during microvascular decompression for patients with primary facial spasm
REN Jian-feng
ZHAO Yong-bin
TIAN Yang
LI Ai-xian
GAO Jing
XU Jin-cheng
WANG Zhi-qin
LUAN Guo-ming
REN Jie
Abstract：Objective To explore the guiding significance of abnormal muscle response(AMR)induced by different stimulation intensity during microvascular decompression(MVD)for patients with hemifacial spasm(HFS).Methods The clinical data of 53 patients with HFS who were treated with MVD under the guidance of AMR from September 2020 to December 2021 were retrospectively analyzed.After intraoperative vascular decompression,further operation was performed according to the AMR induced by the stimulation intensity of 100 mA.Results AMR was stable in all patients after anesthesia and before operation.AMR disappeared in 38 patients after vascular decompression when the stimulation intensity was increased to 100 mA,and AMR reappeared in 13 patients when the stimulus intensity increased to 50-70 mA after AMR disappeared.Fifty-two patients(98.11%)had no facial twitch symptom immediately after surgery,and 1(1.89%)had slight facial twitch symptom at discharge,which was disappeared after 2 months follow-up.Mild and moderate facial paralysis occurred in 5 patients,hearing loss in 2,and cerebrospinal fluid leakage combined with intracranial infection in 2 after operation.Conclusions When the AMR induced by the lower stimulation intensity(<30 mA)disappeared during MVD for patients with HFS,AMR can reappear in some patients when the stimulation intensity increases to 100 mA.This can further guide to discover the small branch of the artery at the root of the facial nerve or the arachnoid trabecula and other related influencing factors that may lead to delayed or non-cured HFS.
Keywords：Hemifacial spasmMicrovascular decompressionAbnormal muscle reaction
Publication Date：2023-10-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 632-634,638 )