Abstract

Dermatomal somatosensory evoked potentials (DSEPs) have been recently added to the armamentarium of techniques that address segmental level issues of spinal cord and nerve roots. Although DSEPs are technically similar to evoked potential to mixed nerve stimulation, good results depend on attention to factors such as stimulating electrode size and location, recording electrode location, alertness, protocol design, and waveform analysis. DSEPs have been used successfully in single-level and multiple-level root disease and in segmental-level evaluation of spinal cord involvement. Compared to other techniques, DSEPs have been at least as successful in identifying abnormalities, and, in some cases, mo-reso. In fact, for the thoracic levels, DSEPs may be considered a unique noninvasive method.

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