Abstract
Monitoring of motor evoked potentials (MEPs) is widely used in preserving motor function during neurosurgical procedures. Transcranial, transcortical, or trans-subcortical stimulation is applied according to the type of disease and surgical procedure involved. The electrodes are inserted into the peripheral muscles or cervical epidural space to obtain recordings. In most cases, intraoperative MEP findings correlate with postoperative motor function. However, we must be careful, as false-negative data caused not by intraoperative procedures but by secondary postoperative events are encountered in some patients. During skull base surgery, monitoring of facial MEPs (FMEPs) and pharyngeal MEPs (PhMEPs) is also useful in predicting postoperative facial motor and swallowing function. In this chapter, we describe how MEPs are elicited and discuss the interpretation of intraoperative findings and the usefulness of monitoring MEPs, FMEPs, and PhMEPs in predicting postoperative function.
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