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Type: Artigo de periódico
Title: Influence Of Local Anesthetics On The Neuromuscular Blockade Produced By Rocuronium: Effects Of Lidocaine And 50% Enantiomeric Excess Bupivacaine On The Neuromuscular Junction.
Author: Braga, Angélica de Fátima de Assunção
Carvalho, Vanessa Henriques
Braga, Franklin Sarmento da Silva
Rodrigues-Simioni, Léa
Loyola, Yolanda Christina S
Potério, Glória Braga
Abstract: The effects of local anesthetics (LA) on neuromuscular transmission and their influence on the neuromuscular blockade produced by competitive neuromuscular blockers have not been fully investigated. The objective of this study was to evaluate, in vitro, the effects of lidocaine and 50% enantiomeric excess bupivacaine (S75-R25) on the neuromuscular blockade produced by rocuronium. The rats were divided in five groups (n = 5) according to the drug used: isolated lidocaine, bupivacaine (S75-R25), or rocuronium (groups I, II, and II); and rocuronium in preparations previously exposed to LAs (groups IV and V). The concentrations used were as follows: 20 microg x mL(-1), 5 microg x mL(-1), and 4 microg x mL(-1) of lidocaine, bupivacaine (S75-R25), and rocuronium, respectively. The following parameters were evaluated: 1) the strength of muscular contraction of the diaphragm to indirect electrical stimulations, before and 60 minutes after the isolated addition of the LAs and rocuronium, and the association AL-rocuronium; and 2) the effects of LAs on membrane potential (MP) and miniature end-plate potentials (MEPP). The effect of LAs on muscle contraction in response to acetylcholine was evaluated in chick biventer cervicis preparations. Isolated lidocaine and bupivacaine (S75-R25) did not change the muscular response and the levels of MPs. In preparations exposed to LAs, rocuroniuminduced blockade was significantly greater than that produced by rocuronium alone. In chick biventer cervicis preparations, lidocaine and bupivacaine (S75R25) decreased contraction in response to acetylcholine. Lidocaine increased the frequency of MEPPs, which was followed by the blockade; bupivacaine (S75R25) caused a reduction in MEPPs followed by blockade. Local anesthetics caused a potentiation of the neuromuscular blockade produced by rocuronium. The results showed pre- and post-synaptic effects.
Subject: Androstanols
Anesthetics, Local
In Vitro Techniques
Neuromuscular Blockade
Neuromuscular Junction
Neuromuscular Nondepolarizing Agents
Rats, Wistar
Citation: Revista Brasileira De Anestesiologia. v. 59, n. 6, p. 725-34
Rights: fechado
Identifier DOI: 
Date Issue: -1-Uns- -1
Appears in Collections:Unicamp - Artigos e Outros Documentos

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