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Summary

We compared the effects of bilateral vs unilateral tibial nerve stimulation of percutaneously recorded spinal evoked potentials (sep) in the lumbar and caudal thoracic area in dogs. The overall amplitude of the sep is increased by this means. Use of this method could improve legibility of the recordings. Amplitudes of root and interneuronal components of the sep are doubled as are cranially transmitted depolarizations. However, the amplitude of the sep component arising from the primary afferents’ depolarization was less than doubled. Latencies of the components were unaffected by bilateral stimulation. Careful observation of the latencies disclosed a 0.9-ms delay in transmission of the fastest component in the midlumbar area. This delay was consistant with results of previous cordotomy experiments, and could influence precision of conduction velocity measurement.

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in American Journal of Veterinary Research