Median nerve evoked potentials during propofol anaesthesia.

Median nerve somatosensory evoked potentials (SSEP) were studied in 10 ASA I patients during general anaesthesia with propofol, vecuronium and fentanyl after premedication with diazepam. N14 and N20 latencies, central conduction time (CCT) and corresponding interpeak amplitudes were assessed at induction, after intubation, during steady state, at re-commencement of spontaneous breathing and during early recovery. Data were compared with pre-induction values. Median nerve SSEP were reproducible throughout the procedure and wave forms were suitable for assessment of neurological disorders. Intra-individual changes were considerable for latencies and amplitudes.