Prognostic value of a bilateral motor threshold criterion for facial corticobulbar MEP monitoring during cerebellopontine angle tumor resection
Tobias Greve1 ・ Liang Wang2 ・ Niklas Thon1 ・ Christian Schichor1 ・ Joerg‑Christian Tonn1 ・ Andrea Szelenyi1
This article shows in a retrospective study that bilateral motor threshold criteria for facial muscle corticobulbar MEPs better predict towards postoperative facial nerve function than ipsilateral motor threshold direct postoperatively and after 7 days. After 3 month it was equally sensitive and specific compared to ipsilateral absolute motor threshold increase. Bilateral prospective studies are needed, also for real-time information and guidance during surgery. Another statement in this article was that amplitude decrement >50% should not be used as a sole warning criterion for facials muscle corticalbulbar MEPs due to its low prognostic power. This was in line with previous studies for extremity mMEPs.
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