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Interactions between suxamethonium and mivacurium or atracurium
1Department of Anaesthesiology, College of Medicine, Hanyang University, Seoul, Korea.
British Journal of Anaesthesia
|November 1, 1996
Summary
This study compared neuromuscular blocking agents suxamethonium, mivacurium, and atracurium. Combining suxamethonium with either mivacurium or atracurium showed antagonistic interactions, suggesting altered dose-response relationships.
Area of Science:
- Anesthesiology and Pharmacology
- Neuromuscular Blockade Research
Background:
- Understanding the dose-response relationships and interactions of neuromuscular blocking agents is crucial for safe and effective anesthesia.
- Suxamethonium, mivacurium, and atracurium are commonly used muscle relaxants with distinct pharmacological profiles.
Purpose of the Study:
- To compare the dose-response curves of suxamethonium, mivacurium, and atracurium in adult patients.
- To quantitatively assess the interactions between suxamethonium and mivacurium, and between suxamethonium and atracurium using isobolographic analysis.
Main Methods:
- 100 adult patients undergoing fentanyl and thiopentone anesthesia were studied.
- Neuromuscular function was monitored using a Myograph 2000.
- Probit analysis determined dose-response curves; isobolographic and fractional analyses evaluated drug interactions.
Main Results:
- The ED50 values were determined for each agent: suxamethonium (198.8 mg kg-1), mivacurium (48.6 mg kg-1), and atracurium (202.1 mg kg-1).
- Isobolographic and fractional analyses revealed antagonistic interactions between suxamethonium-mivacurium and suxamethonium-atracurium combinations.
Conclusions:
- The combination of suxamethonium with either mivacurium or atracurium results in an antagonistic interaction.
- These findings highlight the complex interplay between different neuromuscular blocking agents and inform clinical practice regarding their combined use.