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Effects of bupivacaine on human erythrocytes submitted to stress and evidence for an interaction between bupivacaine and flumazenil
Author(s) -
Lenfant François,
Lahet Jean Jacques,
Volot François,
Schafer Isabelle,
Freysz Marc,
Rochette Luc
Publication year - 1999
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1046/j.1365-2125.1999.00083.x
Subject(s) - bupivacaine , flumazenil , oxidative stress , anesthesia , extracellular , potassium , pharmacology , medicine , chemistry , antagonist , biochemistry , receptor , organic chemistry
Aims To examine the effects of bupivacaine on erythrocytes submitted to an oxidative stress (AAPH) and to provide evidence for an in vitro interaction between bupivacaine and flumazenil.Methods Human erythrocytes were studied with or without AAPH in the presence of different concentrations of bupivacaine (0.15, 0.3, 0.9 and 1.8 mmol l −1 ), or flumazenil (0.16 mmol l −1 ) and with the association of flumazenil and two doses of bupivacaine (0.15 and 0.3 mmol l −1 ). Potassium efflux was measured by flame photometry at t 0 , and every 30 min for 2 h.Results In the absence of AAPH, extracellular potassium remained unchanged. Oxidative stress induced a significant increase in extracellular potassium, which was not modified by incubation with flumazenil. Bupivacaine significantly lowered the increase in extracellular potassium in a dose‐related fashion. The association with flumazenil blunted the effects of bupivacaine.Discussion In this model, bupivacaine proved effective in protecting erythrocytes against oxidative stress. Flumazenil interacted with bupivacaine and blunted its protective effects.