Wang Chengpei, Gu Haomiao, Yue Weigin (Zhongshan Hospital, Shanghai First Medical College)
Tang Yaofa Li Kuanyan (Faculty of Basic Medical Sciences, Shanghai First Medical College)
The analgesic effects of acupuncture anesthesia at different frequencies and intensities of the electric current applied were evaluated experimentally and clinically. Observations carried out on rabbits and normal subjects were demonstrated as follows:
1) Changes in either frequency or intensity would affect pain tolerance. A strong current at 1 Hz or a weak current at 1,000 Hz elicited better results than a weak current at 10 Hz.
2) Elevation of the pain threshold varied directly with the duration of stimulation, stabilizing at 25-35 minutes.
3) After stimulation, elevation of the pain threshold occurred not only in the spinal segments involved but also in distant unrelated spinal segments.
Similar observations were carried out on 118 patients undergoing thyroidectomy. The points "Hegu" and "Neiguan" were stimulated. The patients were divided into three groups at random. Group I, 40 patients were stimulated with a strong current at 1 Hz; group II, 39 patients with a weak current at 1000 Hz and Group III, 39 patients with a weak current at 10 Hz. The percentages of "good analgesia" for the 3 groups were 72.5%, 69.2% and 54.8% respectively (0.05<0.10). This sequential order was similar to that observed in normal human subjects.
Based on the above findings, we feel that the analgesic effect of acupuncture anesthesia could be affected by varying the frequency or intensity of the electric current applied. A strong current at 1 Hz would seem to be the combination of choice, and an induction period of 30 minutes would be optimal.
Tang Yaofa Li Kuanyan (Faculty of Basic Medical Sciences, Shanghai First Medical College)
The analgesic effects of acupuncture anesthesia at different frequencies and intensities of the electric current applied were evaluated experimentally and clinically. Observations carried out on rabbits and normal subjects were demonstrated as follows:
1) Changes in either frequency or intensity would affect pain tolerance. A strong current at 1 Hz or a weak current at 1,000 Hz elicited better results than a weak current at 10 Hz.
2) Elevation of the pain threshold varied directly with the duration of stimulation, stabilizing at 25-35 minutes.
3) After stimulation, elevation of the pain threshold occurred not only in the spinal segments involved but also in distant unrelated spinal segments.
Similar observations were carried out on 118 patients undergoing thyroidectomy. The points "Hegu" and "Neiguan" were stimulated. The patients were divided into three groups at random. Group I, 40 patients were stimulated with a strong current at 1 Hz; group II, 39 patients with a weak current at 1000 Hz and Group III, 39 patients with a weak current at 10 Hz. The percentages of "good analgesia" for the 3 groups were 72.5%, 69.2% and 54.8% respectively (0.05<0.10). This sequential order was similar to that observed in normal human subjects.
Based on the above findings, we feel that the analgesic effect of acupuncture anesthesia could be affected by varying the frequency or intensity of the electric current applied. A strong current at 1 Hz would seem to be the combination of choice, and an induction period of 30 minutes would be optimal.
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