caa a22 4500 606214046 CHVBK 20210128101050.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s00701-015-2492-7 doi (NATIONALLICENCE)springer-10.1007/s00701-015-2492-7 Free-running EMG monitoring during microvascular decompression for hemifacial spasm [Elektronische Daten] [Masafumi Fukuda, Tetsuro Takao, Tetsuya Hiraishi, Yukihiko Fujii] Background: The aim of this work is to determine if free-running electromyography (frEMG) can detect activity before and after microvascular decompression (MVD) treatment for hemifacial spasm (HFS), and to evaluate correlations of frEMG findings with abnormal muscle responses (AMRs) or facial motor-evoked potentials (FMEPs). Methods: To elicit nerve responses while carrying out frEMG recording before and after MVD, saline, a lactic solution, or artificial cerebrospinal fluid was injected onto the root exit zone of the facial nerve. Results: Significantly higher frEMG activity was observed following saline injection than for the other solutions (p < 0.01). For frEMG activity ratios of ≥ 50%, there was a trend towards a greater likelihood of persistent AMRs. When frEMG activity decreased after MVD in the mentalis muscles, FMEP amplitude ratios were significantly smaller than when it did not (65 vs. 94%, p < 0.05). Conclusions: Changes in intraoperative frEMG, AMRs, and FMEPs likely reflect a component of the normalization of hyper-excitability of the facial nerve by MVD for HFS. Springer-Verlag Wien, 2015 Abnormal muscle response nationallicence Facial motor evoked potential nationallicence Free-running EMG nationallicence Hemifacial spasm nationallicence Microvascular decompression nationallicence Fukuda Masafumi Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut Takao Tetsuro Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut Hiraishi Tetsuya Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut Fujii Yukihiko Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut Acta Neurochirurgica Springer Vienna 157/9(2015-09-01), 1505-1512 0001-6268 157:9<1505 2015 157 701 https://doi.org/10.1007/s00701-015-2492-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00701-015-2492-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fukuda Masafumi Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut NATIONALLICENCE 700 1- Takao Tetsuro Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut NATIONALLICENCE 700 1- Hiraishi Tetsuya Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut NATIONALLICENCE 700 1- Fujii Yukihiko Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, 951-8585, Niigata-City, Japan aut NATIONALLICENCE 773 0- Acta Neurochirurgica Springer Vienna 157/9(2015-09-01), 1505-1512 0001-6268 157:9<1505 2015 157 701