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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalRegional Anesthesia and Pain Medicine
Volume34
Issue number3
DOIs
Publication statusPublished - May 1 2009

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Prilocaine
Mepivacaine
Procaine
Bupivacaine
Sensory Thresholds
Walking
Spinal Injections
Lidocaine
Anesthetics
Cauda Equina
Water
Local Anesthetics
Spinal Cord
Electron Microscopy
Catheters
Animal Models
Body Weight
Light
Glucose
Pharmaceutical Preparations

All Science Journal Classification (ASJC) codes

  • Anesthesiology and Pain Medicine

Cite this

Takenami, T., Yagishita, S., Nara, Y., Tsai, Y. H., Hiruma, H., Kawakami, T., & Hoka, S. (2009). Spinal procaine is less neurotoxic than mepivacaine, prilocaine and bupivacaine in rats. Regional Anesthesia and Pain Medicine, 34(3), 189-195. https://doi.org/10.1097/AAP.0b013e31819a27bd

Spinal procaine is less neurotoxic than mepivacaine, prilocaine and bupivacaine in rats. / Takenami, Tamie; Yagishita, Saburo; Nara, Yoshihiro; Tsai, Yang Hsi; Hiruma, Hiromi; Kawakami, Tadashi; Hoka, Sumio.

In: Regional Anesthesia and Pain Medicine, Vol. 34, No. 3, 01.05.2009, p. 189-195.

Research output: Contribution to journalArticle

Takenami, T, Yagishita, S, Nara, Y, Tsai, YH, Hiruma, H, Kawakami, T & Hoka, S 2009, 'Spinal procaine is less neurotoxic than mepivacaine, prilocaine and bupivacaine in rats', Regional Anesthesia and Pain Medicine, vol. 34, no. 3, pp. 189-195. https://doi.org/10.1097/AAP.0b013e31819a27bd
Takenami, Tamie ; Yagishita, Saburo ; Nara, Yoshihiro ; Tsai, Yang Hsi ; Hiruma, Hiromi ; Kawakami, Tadashi ; Hoka, Sumio. / Spinal procaine is less neurotoxic than mepivacaine, prilocaine and bupivacaine in rats. In: Regional Anesthesia and Pain Medicine. 2009 ; Vol. 34, No. 3. pp. 189-195.
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AU - Takenami, Tamie

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AU - Tsai, Yang Hsi

AU - Hiruma, Hiromi

AU - Kawakami, Tadashi

AU - Hoka, Sumio

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N2 - 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.

AB - 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.

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