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J Neurol Neurosurg Psychiatry. 2008 Sep;79(9):1066-70. doi: 10.1136/jnnp.2007.130500. Epub 2008 Feb 1.

Facial nerve motor-evoked potential monitoring during skull base surgery predicts facial nerve outcome.

Author information

1
Department of Neurosurgery, Brain Research Institute, University of Niigata, 1-757 Asahimachi-dori, Chuo-ku, Niigata-City 951-8585, Japan. mfuku529@bri.niigata-u.ac.jp

Abstract

OBJECTIVE:

To determine whether monitoring facial nerve motor-evoked potentials (FNMEPs) elicited by transcranial electrical stimulation during skull base tumour surgery is useful for predicting facial nerve outcome.

METHODS:

This study analysed FNMEP findings in 26 patients with skull base tumours. Corkscrew electrodes positioned at C3 or C4 and Cz were used to deliver supramaximal stimuli (180-550 V). FNMEPs were recorded from the orbicularis oculi and oris muscles. The correlation between the final-to-baseline FNMEP ratio and postoperative facial nerve function was examined.

RESULTS:

Postoperative facial nerve function correlated significantly with the FNMEP ratios in the orbicularis oculi (p = 0.004) and orbicularis oris (p<0.001) muscles. An FNMEP ratio of <50% consistently predicted immediate postoperative facial palsy, although the degree of palsy differed among patients. All patients had satisfactory facial nerve function (House and Brackmann grades I and II) postoperatively if the FNMEP ratio remained at >50%.

CONCLUSIONS:

Intraoperative FNMEP monitoring can be useful for predicting facial nerve function after skull base surgery. This new method is a valuable adjunct to conventional facial nerve monitoring.

PMID:
18245141
DOI:
10.1136/jnnp.2007.130500
[Indexed for MEDLINE]

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