Spinal evoked potentials by median nerve stimulation. An experimental study.:An Experimental Study

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Spinal evoked potentials by median nerve stimulation were recorded on the cervical dura over the dorsal column in cats. The basic waveform consisted of two negative potentials, namely, N I and N II in order of latency.N I was a spike wave which had a short duration and a high amplitude, and two peaks occasionally. The peak latency was about 2ms. N II was a slow wave which had a long duration and a low amplitude. The peak latency was from 3ms to 4ms.The amplitudes of N I and N II were maximum around the 6th cervical spine, and furthermore at upper cervical and thoracic lesions, negative potentials could be recorded.The effect of stimulus intensity, stimulus duration, stimulus frequency, position of ref erence and recording electrodes were investigated on N I and N II.
西日本整形・災害外科学会の論文