Hemodynamic effects of local anesthetics intoxication: experimental study in swine with levobupivacaine and bupivacaine Efeitos hemodinâmicos da intoxicação com anestésicos locais: estudo experimental em suínos com levobupivacaína e bupivacaína
PURPOSE: To compare the hemodynamic repercussions following a toxic dose of levobupivacaine and bupivacaine intravascularly injected in swines. Methods: Large White pigs were anesthetized with thiopental, tracheal intubation was performed and mechanical ventilation was instituted. Hemodynamic variab...
Main Authors: | , , , , , |
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Format: | Article |
Language: | English |
Published: |
Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia
2008-02-01
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Series: | Acta Cirurgica Brasileira |
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-86502008000100010 |
Summary: | PURPOSE: To compare the hemodynamic repercussions following a toxic dose of levobupivacaine and bupivacaine intravascularly injected in swines. Methods: Large White pigs were anesthetized with thiopental, tracheal intubation was performed and mechanical ventilation was instituted. Hemodynamic variables were recorded with invasive pressure monitoring and pulmonary artery catheterization (Swan-Ganz catheter). After a 30-minute resting period, the animals were randomly divided into two groups in a double-blinded fashion and received a bolus injection of 4 mg/kg of either agent for intoxication. Hemodynamic results were then evaluated at 1, 5, 10, 15, 20 and 30 minutes. RESULTS: Levobupivacaine had greater hemodynamic repercussions than racemic bupivacaine. These results disagree with those found when the levorotatory isomer of bupivacaine was used in humans, but are in agreement with recently reported findings in animals. CONCLUSION: Levobupivacaine was shown to be more toxic in pigs than racemic bupivacaine when large doses are injected intravenously.<br>OBJETIVO: Comparar as repercussões hemodinâmicas da levobupivacaína e bupivacaína após uma dose tóxica intravascular em suínos. MÉTODOS: Porcos Large-White foram anestesiados com tiopental, entubados e mantidos em ventilação controlada mecânica. Parâmetros hemodinâmicos foram registrados através de pressão invasiva e cateterização da artéria pulmonar (cateter de Swan-Ganz). Após 30 minutos de repouso, os animais foram divididos aleatoriamente em dois grupos e receberam injeção endovenosa em duplo-cego de 4 mg/kg de um ou outro agente anestésico simulando uma intoxicação. Foram avaliados resultados hemodinâmicos aos 1, 5, 10, 15, 20 e 30 minutos. RESULTADOS: Levobupivacaína teve maiores repercussões hemodinâmicas que a bupivacaína racêmica. Estes resultados discordam daqueles encontrados com o isômero levógiro em humanos, mas estão de acordo com resultados recentemente informados em animais. CONCLUSÃO: Levobupivacaína mostrou ser agente mais tóxico em suínos do que a bupivacaína racêmica quando grandes doses são injetadas por via intravascular. |
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ISSN: | 0102-8650 1678-2674 |