Effects of epidural analgesia on scalp‐recorded somatosensory evoked potentials to posterior tibial nerve stimulation

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Abstract
The effect of epidural analgesia with plain bupivacaine 0.5% on somatosensory evoked potentids (SEP) to electrical stimulation of the posterior tibial nerve was examined in six patients. Epidural analgesia significantly increased onset time and latencies of the early components in SEP, while the amplitudes deercased. These results suggest that SEP may he valuable in the objective evaluation of possible differential neurual effects of local anaesthetic agents following epidural or intrathecal administration.