• Ting-Ting Ying, Shi-Ting Li, Jun Zhong, Xin-Yuan Li, Xu-Hui Wang, and Jin Zhu.
• Department of Neurosurgery, XinHua Hospital, Shanghai JiaoTong University School of Medicine, The Cranial Nerve Disease Center of Shanghai, 1665 KongJiang Rd, Shanghai 200092, China. cadynj@hotmail.com
• Int J Surg. 2011 Jan 1; 9 (4): 347-51.

Background And ObjectivesAbnormal muscle response (AMR) to the electrical stimulation of a branch of facial nerve is a specific electrophysiological feature of primary hemifacial spasm (HFS). The aim of this study was to evaluate the value of AMR monitoring during microvascular decompression surgery (MVD), and the correlation between the AMR changes and the clinical outcomes.MethodsThis study included 241 cases of MVDs. Intraoperative AMR monitoring was performed for each subject. The patients were divided into two groups based on whether the AMR-disappeared or not following decompression of the facial nerve.ResultsPostoperatively, 229 (95.0%) patients were relieved from the spasm, 215 (93.9%) occurred in the AMR-disappeared group, 14 (6.1%) in the non-AMR-disappeared group. The correlation between intraoperative AMR abolition and HFS relief was statistically significant.ConclusionsIntraoperative AMR monitoring was an effective assistant for a successful MVD for the patient with HFS. It is worth being routinely employed during the operation.Copyright © 2011 Surgical Associates Ltd. Published by Elsevier Ltd. All rights reserved.

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