Objective  

To observe the effects of nerve block on MA and EA analgesia and mast cells degranulation in adjuvant arthritis rats in order to analyze the difference between the underlying peripheral mechanism of MA and EA analgesia.

Methods  

Zusanli (ST 36) was chosen as the acupuncturing point on adjuvant arthritis rats. Eighty SD rats were randomized into 10 groups, including control, model, normal+Lido, EA, Lido+EA, DLido+ZEA, Xlido+ZEA, MA, Lido+MA, Dlido+ZMA groups, with 8 rats in each group. Paw Withdraw Latencies and mast cells degranulation ratios were recorded and computed.

Results  

Compared with model group, the pain threshold (PT) and mast cells degranulation ratios of EA and MA groups were obviously increased (P<0.05 or P<0.01). The analgesia effects of both MA and EA were obviously attenuated after nerve block by pretreated with Lidocaine hydrochloride at the acupuncturing point or at the acupiont of proximal end in the same neural stem while they were not by the same manipulations at the acupoint of distal end. Degranulation ratios of mast cells caused by MA or EA were not obviously affected by nerve block.

Conclusion  

The effective signal of nerve conduction of MA analgesia is generated after the degranulation of mast cells in the process of acupoints activation or needle sense and it is the direct cause of generation of nerve signal. In the condition of EA, the acupoints activation is caused by the stimulation of electric signal on nerve receptor while the degranulation of mast cells is concomitant or feedback effect.

目的  

探讨阻滞穴位神经后针刺对于佐剂型关节炎(AA)大鼠镇痛效应和穴区肥大细胞脱颗粒的影响及进一步了解手针和电针镇痛效应的外周机制差异。

方法  

以佐剂型关节炎大鼠为炎症痛模型, 以足三里为治疗穴位, 采用利多卡因预处理 (穴位注射2%盐酸利多卡因), 将 80 只大鼠随机分为正常组 (Control)、 模型组 (Model)、 利多卡因预处理组 (normal+Lido)、 电针组 (Electroacupuncture, EA)、 利多卡因预处理电针组 (Lido+EA)、 犊鼻穴注射利多卡因足三里电针组 (DLido+ZEA)、 下巨虚穴注射利多卡因足三里电针组 (Xlido+ZEA)、 手针组 (Manual Acupuncture, MA)、 利多卡因预处理手针组 (Lido+MA)及犊鼻穴注射利多卡因足三里手针组 (Dlido+ZMA), 每组8 只。 以大鼠缩爪反射潜伏期及肥大细胞脱颗粒率为观察指标.

结果  

EA及MA组痛阈都高于M组 (P<0.05或P<0.01), 两组肥大细胞脱颗粒率都明显高于M组 (P<0.01)。 说明阻滞针刺穴位或同神经干近心端穴位神经对针刺的镇痛效应有明显的抑制作用, 同样的操作在远心端穴位则无影响, 神经阻滞对针刺 (电针或手针) 引起的穴区肥大细胞脱颗粒无明显影响。

结论  

在手针情况下, 针刺镇痛有效神经传导信号在穴位的启动和针感的产生是在肥大细胞脱颗粒之后, 它是产生神经信号的直接原因; 而对电针情况, 电信号是直接刺激神经感受器产生信号启动, 肥大细胞脱颗粒成为伴随或反馈效应。