Spinal procaine is less neurotoxic than mepivacaine, prilocaine and bupivacaine in rats

Tamie Takenami, Saburo Yagishita, Yoshihiro Nara, Yang Hsi Tsai, Hiromi Hiruma, Tadashi Kawakami, Sumio Hoka

研究成果: ジャーナルへの寄稿学術誌査読

20 被引用数 (Scopus)


Background and Objectives: Lidocaine has been reported to be more neurotoxic than other local anesthetics. Alternatives to lidocaine with lower toxicity and shorter duration of action are desirable. Therefore, we compared the histologic and functional changes induced by intrathecal injection of prilocaine, mepivacaine, procaine, and bupivacaine in rats. Methods: Rats (n = 184) randomly received via an intrathecal catheter 0.12 μL/g body weight of 2%, 10%, 16%, or 20% prilocaine, mepivacaine, or procaine; 0%, 0.5%, 2.5%, 4%, or 5% bupivacaine in distilled water; or distilled water or 15% glucose solution alone as a control. We evaluated neurofunction by analyzing walking behavior and sensory threshold and examined the L3 spinal cord, posterior and anterior roots, and cauda equina by light and electron microscopy. Results: The recovery time to normal ambulation after intrathecal injection was significantly faster with procaine than with the other 3 drugs at all concentrations. There were no significant differences in the sensory threshold among the 4 anesthetics. Histologic damage was observed only in rats treated with greater than 16% prilocaine or mepivacaine or with greater than 4% bupivacaine. Histologic damage occurred at the posterior root and posterior white matter and was characterized by axonal degeneration. Rats treated with procaine, even at 20%, showed no histologic abnormalities. Conclusion: In this animal model, the neurotoxicity of intrathecal procaine was the mildest, and the recovery time to ambulation with procaine was the fastest among the 4 tested anesthetics.

ジャーナルRegional Anesthesia and Pain Medicine
出版ステータス出版済み - 5月 1 2009

!!!All Science Journal Classification (ASJC) codes

  • 麻酔学および疼痛医療


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