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KMID : 1140920180420020352
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Annals of Rehabilitation Medicine
2018 Volume.42 No. 2 p.352 ~ p.357
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Intraoperative Monitoring of Hypoglossal NerveUsing Hypoglossal Motor Evoked Potential inInfratentorial Tumor Surgery:A Report of Two Cases
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Kim Seung-Yeun
Im Hyo-Won
Choi Young-Doo
Kim Kee-Won
Kim Jin-Wook
Kim Yong-Hwy
Seo Han-Gil
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Abstract
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The hypoglossal nerve (CN XII) may be placed at risk during posterior fossa surgeries. The use of intraoperativemonitoring (IOM), including the utilization of spontaneous and triggered electromyography (EMG), from tonguemuscles innervated by CN XII has been used to reduce these risks. However, there were few reports regardingthe intraoperative transcranial motor evoked potential (MEP) of hypoglossal nerve from the tongue muscles.For this reason, we report here two cases of intraoperative hypoglossal MEP monitoring in brain surgery as anindicator of hypoglossal deficits. Although the amplitude of the MEP was reduced in both patients, only in thecase 1 whose MEP was disappeared demonstrated the neurological deficits of the hypoglossal nerve. Therefore,the disappearance of the hypoglossal MEP recorded from the tongue, could be considered a predictor of thepostoperative hypoglossal nerve deficits.
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KEYWORD
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Intraoperative monitoring, Motor evoked potentials, Hypoglossal nerve
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