Effect of extradural morphine on somatosensory evoked potentials to dermatomal stimulation

Abstract

The effect of the extradural (L2-3) administration of morphine 6 mg on early (< 0.5 s) somatosensory evoked cortical potentials (SEP) to electrical stimulation of the L1- and S1-dermatomes was examined in eight patients. Extradural morphine did not influence SEP amplitude. SEP latency did not change, except for a minor increase in the latencies of the onset and the P2 components following S1 stimulation. © 1987 Copyright: 1987 British Journal of Anaesthesia.