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Acta Neurochirurgica

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01-09-2015 | Clinical Article - Functional

Free-running EMG monitoring during microvascular decompression for hemifacial spasm

Authors: Masafumi Fukuda, Tetsuro Takao, Tetsuya Hiraishi, Yukihiko Fujii

Published in: Acta Neurochirurgica | Issue 9/2015

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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Title: Free-running EMG monitoring during microvascular decompression for hemifacial spasm
Authors: Masafumi Fukuda
Tetsuro Takao
Tetsuya Hiraishi
Yukihiko Fujii
Publication date: 01-09-2015
Publisher: Springer Vienna
Published in: Acta Neurochirurgica / Issue 9/2015
Print ISSN: 0001-6268
Electronic ISSN: 0942-0940
DOI: https://doi.org/10.1007/s00701-015-2492-7

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Free-running EMG monitoring during microvascular decompression for hemifacial spasm

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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