Neuromuscular interactions between mivacurium and esmolol in rabbits.
We compared the dose-response relationship and the neuromuscular blocking effects of mivacurium during infusions of esmolol in 40 anaesthetised rabbits. Train-of-four stimuli were applied every 10 s to the common peroneal nerve and the force of contraction of the tibialis anterior muscle was measured. Plasma cholinesterase activity decreased by 13% after esmolol infusion. The ED95 of mivacurium increased significantly from 29 (4.8) micrograms.kg-1 with placebo to 61 (9.8) micrograms.kg-1 during esmolol 100 micrograms.kg-1.min-1, 49 (8.2) micrograms.kg-1 during esmolol 300 micrograms.kg-1.min-1 and 54 (7.3) micrograms.kg-1 during esmolol 500 micrograms.kg-1.min-1, respectively (p < 0.001). The duration of neuromuscular block with mivacurium 0.16 mg.kg-1 was prolonged by 30% with esmolol due to diminished plasma cholinesterase activity (p < 0.05). Heart rate and mean arterial blood pressure decreased by 15% with esmolol (p < 0.05). The results of this study show that, in rabbits, esmolol decreased plasma cholinesterase activity, antagonised the neuromuscular blocking potency of mivacurium and prolonged its neuromuscular blocking effect.
Kim
K S
KS
Department of Anesthesiology, Hanyang University Hospital, Seoul, South Korea.
Kim
K H
KH
Shin
W J
WJ
Yoo
H K
HK
D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002802:Cholinesterases / Q000097:blood; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D006339:Heart Rate / Q000187:drug effects; D007546:Isoquinolines / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000077590:Mivacurium; D009469:Neuromuscular Junction / Q000187:drug effects*; D003473:Neuromuscular Nondepolarizing Agents / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011412:Propanolamines / Q000494:pharmacology*; D011817:Rabbits
D000319:Adrenergic beta-Antagonists; D007546:Isoquinolines; D003473:Neuromuscular Nondepolarizing Agents; D011412:Propanolamines; D000077590:Mivacurium; D002802:Cholinesterases; C036604:esmolol