2-Adamantanamine produces prolonged spinal block in rats

Yu Wen Chen, Chia Ming Chen, Kuo Sheng Liu, Jhi Joung Wang, Ching Hsia Hung

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Abstract

We aimed to investigate the local anesthetic effect of 2-adamantanamine in spinal anesthesia. The dose–response curves were constructed after intrathecally injecting the rats with five doses of 2-adamantanamine and a common local anesthetic mepivacaine. The quality and duration of 2-adamantanamine at producing spinal nociceptive, proprioceptive and motor block were compared with that of mepivacaine. We revealed that 2-adamantanamine provoked spinal nociceptive, proprioceptive and motor block dose-dependently. On the 50% effective dose (ED50) basis, the rank of potency was mepivacaine > 2-adamantanamine at producing spinal nociceptive, proprioceptive and motor block (p < 0.05 for the differences). 2-Adamantanamine, but not mepivacaine produced more nociceptive block than motor block (p < 0.05). At the equianesthetic doses (ED75, ED50, and ED25), the nociceptive block duration caused by 2-adamantanamine was greater than that caused by mepivacaine (p < 0.01 for the differences). These preclinical data showed that 2-adamantanamine is less potent than mepivacaine, while 2-adamantanamine provokes greater duration of spinal nociceptive block than mepivacaine. Furthermore, 2-adamantanamine demonstrates a more nociceptive-selective action over motor block.

Original languageEnglish
Pages (from-to)168-172
Number of pages5
JournalNeuroscience Letters
Volume653
DOIs
Publication statusPublished - 2017 Jul 13

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All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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