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不同参数组合电针对SNL大鼠镇痛效应观察及对脊髓背角PGE2的影响

2017-10-17周杰陈贞羽龚杰

中国现代医生 2017年24期

周杰 陈贞羽 龚杰

[摘要] 目的 評价不同参数组合电针对神经病理痛的镇痛效应及相关机制探索,筛选出电针治疗神经病理性疼痛的最佳参数组合。 方法 30只SD雄性大鼠,随机分为正常组(N 组)、模型组(M 组)、2 Hz电针组、100 Hz电针组和2/100 Hz电针组。采用脊神经结扎(spinal nerve ligation,SNL)的方法建立大鼠神经病理痛模型。用电针干预大鼠患侧“足三里”和“昆仑”穴,于造模前,造模后 24 h,治疗后第 1、3、5、7、9、10天检测大鼠右后足PWTs。用酶联免疫吸附法(ELISA)法检测脊髓背角(SCDH)前列腺素E2(PGE2)的含量。 结果 各时间点,2 Hz电针组大鼠痛阈均高于M组(P<0.05);电针治疗后第3、5、7、9天,2 Hz电针组大鼠痛阈均高于100 Hz电针组(P<0.05);电针治疗后第3、5、7天,2 Hz电针组大鼠痛阈高于2/100 Hz电针组(P<0.05);各时间点,2/100 Hz电针组大鼠痛阈高于M组(P<0.05);电针治疗后第3天,2/100 Hz电针组大鼠痛阈高于100 Hz电针组(P<0.05);电针治疗后第1、7、9、10天,100Hz电针组大鼠痛阈高于M组(P<0.05)。各电针组大鼠脊髓背角PGE2含量均低于M组和N组(P<0.01)。 结论 不同参数组合电针均能减轻神经病理性疼痛,但不同参数组合电针镇痛效果有所不同,以2 Hz频率电针最佳。

[关键词] 电针;频率;神经病理痛;镇痛;参数

[中图分类号] R454.1;R245.31+9 [文献标识码] A [文章编号] 1673-9701(2017)24-0033-04

[Abstract] Objective To evaluate the analgesic effect of various parameter-combined electroacupuncture on neuropathic pain and its mechanism,and to select the optimal parameter combination of electroacupuncture in treatment of neuropathic pain. Methods 30 male SD rats were randomly divided into normal group(group N), model group(group M), 2 Hz electroacupuncture group, 100 Hz electroacupuncture group and 2/100 Hz electroacupuncture group. The neuropathic pain model was set up by spinal nerve ligation(SNL). Electroacupuncture was used to stimulate Zusanli and Kunlun of the affected side of rats. PWTs of right rear were detected before modeling and at 24 h, 1 d, 3 d, 5 d, 7 d, 9 d, and 10 d after treatment. ELISA was used to detect the PGE2 level in spinal cord dorsal horn. Results At each time point, the pain threshold of rats was significantly higher in the 2 Hz group than in group M(P<0.05). At 3rd, 5rd, 7rd, and 9rd after treatment, the pain threshold of rats was significantly higher in the 2 Hz group than in the 100 Hz group(P<0.05). At day 3, 5, and 7 after treatment,the pain threshold of rats was significantly higher in the 2Hz group than in the 2/100 Hz group(P<0.05). At each time point, the pain threshold of rats was significantly higher in the 2/100 Hz group than in group M(P<0.05). At 3rd day after treatment, the pain threshold of rats was significantly higher in the 2/100 Hz group than in the 100 Hz group(P<0.05). At the 1st, 7th, 9th, and 10th, the pain threshold of rats was significantly higher in the 100 Hz group than in group M(P<0.05). The PGE2 levels in SCDH were significantly lower in each groups than in group M and group N(P<0.01). Conclusion Various parameter-combined electroacupuncture can all reduce the neuropathic pain, but with different analgesic effects, and the frequency of 2 Hz can reach an optimal effect.endprint

[Key words] Electroacupuncture; Frequency; Neuropathic pain; Analgesia; Parameter

三叉神经痛、带状疱疹后遗痛、糖尿病周围神经痛等均属于神经病理痛(neuropathic pain),其人群患病率约0.6%~1.5%[1],其疼痛剧烈,治疗困难,患者生活质量普遍较低[2],临床常用抗癫痫药、三环类抗抑郁药等治疗,疗效不确切,且副作用较大。电针(electroacupuncture,EA)是针灸临床最常用的疼痛治疗方法,广泛应用于各类急慢性疼痛[3,4],且被研究证实确切有效[5,6]。电针参数是其镇痛起效的关键,但有一份调查显示78.4%的中医师不清楚应用哪种刺激参数达到最佳的镇痛效果[7]。而不同研究表明,不同频率电针对神经病理性疼痛均有明显的镇痛作用[8-10],这更让临床医生无所适从。

课题组前期发现电针治疗神经病理性疼痛应选用频率为2 Hz、100 Hz的电针,不推荐使用15 Hz和50 Hz电针[11],那么不同参数组合电针对神经病理痛大鼠镇痛效果如何,是否疏密波电针镇痛效果优于连续波?本研……

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