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KMID : 0361420140380050682
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Journal of Korean Academy of Rehabilitation Medicine
2014 Volume.38 No. 5 p.682 ~ p.688
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Analgesic Effect of Intrathecal Gabapentin in a Rat Model of Persistent Muscle Pain
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Kang Tae-Wook
Sohn Min-Kyun
Park Noh-Kyoung
Ko Sang-Hyung
Cho Kyoung-Jin
Beom Jae-Won
Kang Sang-Kuk
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Abstract
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Objective: To evaluate the analgesic effect of intrathecal gabapentin therapy on secondary hyperalgesia in a rat model of persistent muscle pain.
Methods: Intrathecal catheters were implanted into rats. Mechanical secondary hyperalgesia was induced by repeated intramuscular injections of acidic solution into the gastrocnemius muscle. Gabapentin was administrated intrathecally. Rats were allocated to control and experimental (gabapentin 30, 100, 300, and 1,000 mg) group. After gabapentin administration, mechanical withdrawal threshold was measured every 15 minutes and the motor function was measured 30 minutes later.
Results: Mechanical hyperalgesia was evoked after the second acidic buffer injection. There was a significant improvement on the mechanical threshold after administration of 100, 300, and 1,000 mg gabapentin compared to pre-injection and the control group. The analgesic effect continued for 105, 135, and 210 minutes, respectively. To discern side effects, motor function was measured. Motor function was preserved in both groups after gabapentin administration, except for rats who received 1,000 mg gabapentin.
Conclusion: Intrathecal gabapentin administration produces dose-dependent improvements in mechanical hyperalgesia in a persistent muscle pain rat model. This implicates the central nervous system as having a strong influence on the development of persistent mechanical hyperalgesia. These results are helpful in understanding the pathophysiology of secondary hyperalgesia and in the treatment of patients with chronic muscle pain.
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KEYWORD
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Analgesic effect, Intrathecal gabapentin injection, Persistent muscle pain
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