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The solubility of long-acting local anesthetics in lipid emulsions and the high capacity of binding of these emulsions most probably explain their clinical efficacy in case of toxicity. The long-chain triglyceride emulsion Intralipid appears to be about 2.5 times more efficacious than the 50/50 medium-chain/long-chain Medialipide emulsion. Also, because of their higher hydrophobicity, racemic bupivacaine and levobupivacaine seem to clear more rapidly than ropivacaine.
Mazoit et al. (Thu,) studied this question.
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