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British Journal of Anaesthesia, Vol 77, Issue 5 612-616, Copyright © 1996 by The Board of Management and Trustees of the British Journal of Anaesthesia

CLINICAL INVESTIGATIONS

Interactions between suxamethonium and mivacurium or atracurium

K. S. Kim, D. J. Na and S. U. Chon
Department of Anaesthesiology, College of Medicine, Hanyang University, Seoul, Korea

We have compared the dose-response relationships of suxamethonium, mivacurium and atracurium and examined the interactions of suxamethonium with mivacurium or atracurium in humans by isobolographic analysis. We studied 100 adult patients during fentanyl and thiopentone anaesthesia. Neuromuscular function was monitored using a Myograph 2000 (Biometer Co., Odense, Denmark). The dose-response curves were determined by probit analysis. Isobolographic and fractional analyses were used to assess quantitatively the combined effect of equipotent doses of suxamethonium, mivacurium and atracurium and to define the type of interaction between suxamethonium and mivacurium or atracurium. The ED50 values for suxamethonium, mivacurium and atracurium were 198.8 (95% confidence interval 190.7-206.9), 48.6 (45.4-51.8) and 202.1 (197.9-206.2) mg kg-1, respectively. Isobolographic and fractional analyses of the suxamethonium-mivacurium and suxamethonium-atracurium combinations demonstrated antagonistic interactions.
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