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Free-running EMG monitoring during microvascular decompression for hemifacial spasm

  • Clinical Article - Functional
  • Published:
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Abstract

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.

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Acknowledgments

The authors thank Atsushi Shirasawa, Motohiro Soma, and Kiyoe Nonaka for providing technical support.

Conflict of interest

All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.

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Authors and Affiliations

  1. Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, Niigata-City, 951-8585, Japan

    Masafumi Fukuda, Tetsuro Takao, Tetsuya Hiraishi & Yukihiko Fujii

Authors
  1. Masafumi Fukuda
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  2. Tetsuro Takao
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  3. Tetsuya Hiraishi
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  4. Yukihiko Fujii
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Correspondence to Masafumi Fukuda.

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Fukuda, M., Takao, T., Hiraishi, T. et al. Free-running EMG monitoring during microvascular decompression for hemifacial spasm. Acta Neurochir 157, 1505–1512 (2015). https://doi.org/10.1007/s00701-015-2492-7

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  • DOI: https://doi.org/10.1007/s00701-015-2492-7

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