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British Journal of Anaesthesia, 1989, Vol. 63, No. 5 561-564
© 1989 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

EFFECTS OF HALOTHANE ON MOTOR EVOKED POTENTIAL RECORDED IN THE EXTRADURAL SPACE

B. A. LOUGHNAN, M.B., CH.B., F.F.A.R.C.S., S. K. ANDERSON, M.B., B.S., F.F.A.R.C.S., M. A. HETREED, M.B., B.S., F.F.A.R.C.S., P. F. WESTON, B.SC., S. G. BOYD, M.D. and G. M. HALL, M.B., B.S., PH.D., F.I.BIOL., F.F.A.R.C.S.

Department of Anaesthetics, Royal Postgraduate Medical School London W12 OHS
Department of Anaesthetics, Royal National Orthopaedic Hospital Stanmore, Middlesex HA7 4LP
Department of Clinical Neurophysiology, The Hospital for Sick Children Great Ormond Street, London WCI

Correspondence to G.M.H.

We studied the effects of supplementing nitrous oxide—oxygen anaesthesia with halothane (1 MAC end-tidal concentration) on the motor evoked potential recorded in the extradural space of eight patients before corrective surgery for idiopathic adolescent scoliosis. The motor cortex was stimulated electrically through the scalp. An additional eight patients in whom anaesthesia was supplemented with an infusion of propofol acted as a control group. Halothane had no significant effect on the amplitude or latency of the motor evoked potential. We conclude that halothane is unlikely to alter the interpretation of motor evoked potentials recorded extradurally during scoliosis surgery.


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