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To the Editor: We read with great interest the article by Wilkinson and Kaufmann (Monitoring of facial muscle motor evoked potentials during microvascular decompression for hemifacial spasm: evidence of changes in motor neuron excitability. J Neurosurg 103:64–69, 2005). The authors have tried to prove the hypothesis that facial motoneurons become less excitable after MVD in patients with HFS. We strongly believe that this hypothesis can be proved; however, we are deeply concerned about the method used in this study.
First, the authors elicited MEPs in facial nerve innervated muscles using a single stimulus applied
DongCCMacDonaldDBAkagamiRWesterbergBAlkhaniAKanaanI: Intraoperative facial motor evoked potential monitoring with transcranial electrical stimulation during skull base surgery. Clin Neurophysiol116:588–5962005