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• W2032034626 abstract "Amitriptyline, a tricyclic antidepressant, is frequently used orally for the management of chronic pain. To date there is no report of amitriptyline producing peripheral nerve blockade. The authors therefore investigated the local anesthetic properties of amitriptyline in rats and in vitro.Sciatic nerve blockade was performed with 0.2 ml amitriptyline or bupivacaine at selected concentrations, and the motor, proprioceptive, and nociceptive blockade was evaluated. Cultured rat GH3 cells were externally perfused with amitriptyline or bupivacaine, and the drug affinity toward inactivated and resting Na+ channels was assessed under whole-cell voltage clamp conditions. In addition, use-dependent blockade of these drugs at 5 Hz was evaluated.Complete sciatic nerve blockade for nociception was obtained with amitriptyline for 217 +/- 19 min (5 mM, n = 8, mean +/- SEM) and for 454 +/- 38 min (10 mM, n = 7) versus bupivacaine for 90 +/- 13 min (15.4 mM, n = 6). The time to full recovery of nociception for amitriptyline was 353 +/- 12 min (5 mM) and 656 +/- 27 min (10 mM) versus 155 +/- 9 min for bupivacaine (15.4 mM). Amitriptyline was approximately 4.7-10.6 times more potent than bupivacaine in binding to the resting channels (50% inhibitory concentration [IC50] of 39.8 +/- 2.7 vs. 189.6 +/- 22.3 microM) at - 150 mV, and to the inactivated Na+ channels (IC50 of 0.9 +/- 0.1 vs. 9.6 +/- 0.9 microM) at -60 mV. High-frequency stimulation at 3 microM caused an additional approximately 14% blockade for bupivacaine, but approximately 50% for amitriptyline.Amitriptyline is a more potent blocker of neuronal Na+ channels than bupivacaine in vivo and in vitro. These findings suggest that amitriptyline could extend its clinical usefulness for peripheral nerve blockade." @default.
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• W2032034626 date "2001-04-01" @default.
• W2032034626 modified "2023-10-08" @default.
• W2032034626 title "Amitriptyline versus Bupivacaine in Rat Sciatic Nerve Blockade" @default.
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• W2032034626 doi "https://doi.org/10.1097/00000542-200104000-00021" @default.
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