电针“足三里”穴对体感皮层慢痛反应的影响

<正> 过去,在痛觉和针刺镇痛的研究中,多以强电脉冲刺激传入神经模拟伤害性刺激,并以此引起的反应作为疼痛的指标。但强电刺激常引起多种神经纤维包括与痛觉无关的Aαβ纤维、传导“快痛”的 Aδ纤维以及传导慢痛的 C 类纤维同时兴奋。当多种神经纤维的传入冲动同时进入神经中枢时,又常常发生相互影响,往往是传导速度快的 A 类纤维传入抑制了传导较慢的 C 类纤维传入。因此,以前所用的痛反应指标不反映慢痛。

INFLUENCE OF ELECTRO—ACUPUNCTURE OF“ZUSANLI”POINT ON THE RESPONSE OF SOMATOSENSORY CORTEX TO SLOW PAIN

Experiments were performed on cats under the treaments of chloralose and Flaxelil.The cortical evoked potentials (C-CEP) which were elicited by C-fibes inputs of saphenous nerve in the somatosensory cortex were used as an index of slow pain.The influence of electro-acupuncture of “Zusanli” point on C-CEP was observed.The results indicated that the electro-acupuncture had an obvious inhibition on C-CEP,which was consisted of two phases:Early inhibition and late inhibition.Naloxone (0.1mg/kg,i.v.) could partially blook the late inhibition on C-CEP but had a little effect on the early inhibition.It was revealed that the early inhibitory effect of electro-acupuncture on C-CEP was different from the late inhibitory on which might be associated with release of endogenous opiate like substances (OLS).