2-3-13. Components analysis of transcranial electrical stimulation motor evoked potentials

Muscle action potentials induced by transcranial electrical stimulation (TCSMEP) are well used to know the impairment of motor function under general anesthesia. Though the components of waveforms are not known. We analyzed the origin or meaning of TCSMEP waveforms. All data were obtained from gastrocnemius with a pair of needle electrodes (belly-tendon method) during six times spinal surgeries (intramedurally tumor 5, disk herniation 1). Waveforms consisted of the initial negative spiky wave's complex (INSWC) and the dull wave of the latter half (LHDW).

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