211397 The value of abnormal muscle response monitoring during microvascular decomprssion surgery for hemifacial spasm
2011-08-15YingTingting应婷婷DeptNeurosurgXinhuaHospAffilShanghaiJiaotongUnivSchoolMedShanghai200092ChinNeurosurg201127544548
/Ying Tingting(应婷婷,Dept Neurosurg,Xinhua Hosp, AffilShanghaiJiaotongUniv,School Med,Shanghai 200092)…∥Chin J Neurosurg.-2011,27(5).-544 ~548
ObjectiveAbnormal muscle response(AMR)to the electrical stimulation of a branch of facial nerve is a specific electrophysiological feature of primary hemifacial spasm(HFS).Although the correlation between intraoperative AMR findings and postoperative results in patients with HFS were investigated before,the AMR monitoring has not been employed widely during the microvascular decompression(MVD)surgery.The aim of this study was to evaluate the value of AMR monitoring during MVD,and the correlation between AMR changes and clinical outcome.MethodsThis study included 241 cases of MVD.Intraoperative AMR monitoring was performed on each subject.The patients were divided into two groups based on whether AMR wave disappeared or not following decompression of facial nerve.Results
AMR disappeared after MVD in 175 patients.Among these 175 patients,165(94.3%)patients were relieved from HFS 1 week after HFS.Out of the 66 patients in whom the AMR persisted after MVD,52(78.8%)patients were relieved.The correlation between intraoperative AMR abolition and HFS relief was statistically significant(P <0.05).ConclusionIntraoperative AMR monitoring is an effective assistant for a successful MVD for the patient with HFS.It may be helpful in predicting outcomes in short-term and identifying offending vessels,so it should be monitored routinely during MVD.25 refs,2 figs.
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