Intraoperative Monitoring of Segmental Evoked Spinal Cord Potentials in Cervical Lesions
Evoked spinal cord potentials (ESCPs) are divided into segmental and conductive potentials [1–8]. The segmental potentials are obtained from the segmental level of the spinal cord by stimulating the peripheral nerves [1–3]. The conductive potentials are recorded at the rostral portion of the spinal cord far from the stimulated segment by stimulating the peripheral nerves or the spinal cord directly [5, 7]. In this paper, we report on segmental ESCPs directly obtained from the exposed dural surface intraoperatively in various cervical diseases. Although it seemed difficult to obtain completely normal waveforms in our operative cases, the evaluation of waveforms was tried by comparing them through pre- and postdecompression periods and by comparing the difference between affected and nonaffected sides. We also tried to evaluate whether monitoring of segmental ESCPs was useful as an indicator for sufficient decompression to the spinal cord and the nerve root. We obtained some interesting findings during these intraoperative monitorings.
KeywordsNerve Root Posterior Horn Cervical Spondylosis Median Nerve Stimulation Recorded Waveform
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