L Guowei, Shi Guang, Wang Yongning, Zhao Guoshun, Xing Weichang, Wang Yuanshen
(Laboratory of Acupuncture Anesthesia and Encephalology, Beijing Second Medical College and Group of Acupuncture Anesthesia, Department of Anesthesia, Beijing Jishuitan Hospital)
In view of the close relationship between large fibers and transmission of impulses from acupuncture point and the inhibitory action exerted by large fibers on small fibers, the present study was undertaken to investigate the influence of the increased activity of the large fiber on the analgesia produced by needling.
Three parts are included in this work: (1) The action of local (in the operating field) synchronized stimulation on the analgesia induced by needling of the remote point. (2) The effect of strong stimulation of the acupuncture point which is infiltrated with dilute local anesthetic on acupuncture analgesia. (3) The role of direct current in blocking the afferent fibers from the origin of pain. The results were as follows.
(Laboratory of Acupuncture Anesthesia and Encephalology, Beijing Second Medical College and Group of Acupuncture Anesthesia, Department of Anesthesia, Beijing Jishuitan Hospital)
In view of the close relationship between large fibers and transmission of impulses from acupuncture point and the inhibitory action exerted by large fibers on small fibers, the present study was undertaken to investigate the influence of the increased activity of the large fiber on the analgesia produced by needling.
Three parts are included in this work: (1) The action of local (in the operating field) synchronized stimulation on the analgesia induced by needling of the remote point. (2) The effect of strong stimulation of the acupuncture point which is infiltrated with dilute local anesthetic on acupuncture analgesia. (3) The role of direct current in blocking the afferent fibers from the origin of pain. The results were as follows.
(1) In rabbits the effect of acupuncture analgesia for laparotomy produced by needling and local synchronized stimulation was significantly better than that produced by needling alone (P<0.05). (2) The rate of "excellent" and "good" effect of the test group was increased by 25% as compared with that of control group (P=3 X 10{-5}). The rate of pain-free skin cutting in the test group was raised by 32% (P=5 x 10{-7}), the rate of painfree traction of tube in tubal ligation was raised from 0% on the control side to 76% on the test side in the same individual (P=5 x 10{-7}). (3) Following the injection of 0.1% novocain into point "Hegu" (L.I.4) in the normal subject, the intensity of stimulation which could be tolerated was 0.5-1.0 time greater than that before injection; and the pain threshold of the skin of ipsilateral arm was significantly increased (P<0.05). (4) In the clinic, the rate of "excellent" and "good" effect of acupuncture analgesia for the lower abdomenal operation in the test group with novocain block in point "Sanyinjiao" (Sp. 6) was raised by 30.9% as compared with that of the control group (P<0.01). (5) In rabbits the pain induced by nerve stimulation could be blocked completely without any apparent "distress" by direct current of adequate intensity applied to the same nerve.
The results indicated the block of point with dilute novocain may strengthen the needling sensation and increase the acupuncture analgesic effect.
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