Intraoperative Monitoring of Hypoglossal Nerve Using Hypoglossal Motor Evoked Potential in Infratentorial Tumor Surgery: A Report of Two Cases

The hypoglossal nerve (CN XII) may be placed at risk during posterior fossa surgeries. The use of intraoperative monitoring (IOM), including the utilization of spontaneous and triggered electromyography (EMG), from tongue muscles innervated by CN XII has been used to reduce these risks. However, the...

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Bibliographic Details
Published in:Annals of rehabilitation medicine 2018, 42(2), , pp.352-357
Main Authors: Kim, Seung Yeun, Im, Hyo Won, Choi, Young-Doo, Kim, Keewon, Kim, Jin Wook, Kim, Yong Hwy, Seo, Han Gil
Format: Article
Language:English
Subjects:
Case Report
Hypoglossal nerve
Intraoperative monitoring
Motor evoked potentials
재활의학
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Summary:The hypoglossal nerve (CN XII) may be placed at risk during posterior fossa surgeries. The use of intraoperative monitoring (IOM), including the utilization of spontaneous and triggered electromyography (EMG), from tongue muscles innervated by CN XII has been used to reduce these risks. However, there were few reports regarding the 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 an indicator of hypoglossal deficits. Although the amplitude of the MEP was reduced in both patients, only in the case 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 the postoperative hypoglossal nerve deficits.
ISSN:2234-0645
2234-0653
DOI:10.5535/arm.2018.42.2.352