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British Journal of Anaesthesia, Vol 84, Issue 1 43-47, Copyright © 2000 by Oxford University Press

ARTICLES

Rocuronium potency and recovery characteristics during steady-state desflurane, sevoflurane, isoflurane or propofol anaesthesia

M Bock, K Klippel, B Nitsche, A Bach, E Martin and J Motsch
Department of Anaesthesiology, University of Heidelberg, Germany.

We have studied the potency and recovery characteristics of rocuronium during 1.25 MAC of isoflurane, desflurane, sevoflurane or propofol anaesthesia in 84 patients using electromyography. Potency was determined by a cumulative bolus technique. The mean ED50 of rocuronium was 169 (SD 41), 126 (32), 121 (28) and 136 (25) micrograms kg-1 during propofol, isoflurane, sevoflurane and desflurane anaesthesia, respectively (ns), and ED90 values were 358 (62), 288 (29), 289 (28) and 250 (28) micrograms kg-1, respectively. The reduction in ED90 was statistically significant for all three inhalation anaesthetics (P < 0.05) compared with propofol. After 120 min, the cumulative infusion rate of rocuronium to obtain twitch depression of 90-95% was 9.0 (1.9), 6.3 (1.6), 6.1 (2.0) and 6.1 (1.1) micrograms kg-1 min-1 during propofol, isoflurane, sevoflurane and desflurane anaesthesia, respectively (P < 0.01). Recovery index was 22 (13), 27 (10), 28 (13) and 26 (14) min under propofol, isoflurane, sevoflurane and desflurane anaesthesia, respectively (ns). There were no significant differences between the three potent inhalation anaesthetics in relation to potency, infusion requirements or recovery characteristics of rocuronium.
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