Yang Jizeng, Song Kaiyuan, Qin Biguang (Research Group of Acupuncture Anesthesia, Chengtu College of Traditional Chinese Medicine)
The plethysmography of finger-tip of 21 patients with thyroid operations under electroacupuncture were studied in 1975. When the plethysmograph of these patients were tested by painful stimulation, the amplitudes were decreased considerably; if the patients felt an obvious sensation of pain during operation, the amplitudes were also markedly narrowed, sometimes associated with increasing of frequency or shifting of the baseline of these waves. After treatment with meperidine or procaine, the patient became calm, the amplitudes restored with stable baseline.
There were two characteristics in plethysmography through the whole operation procedure:
1) There was a progressive rise of amplitudes after acupuncture anesthesia, but it decreased gradually from the beginning of suture of muscles till the completion of skin suture. After skin closure, the amplitude increased again slightly. The amplitudes during entire surgical operation were always higher than that before operation. It was most obvious in the cases of Grade I effectiveness and less in Grade III.
2) The amplitudes decreased at the beginning of every step of operation such as the beginning of acupuncture anesthesia, sterilization of operative field, incision of skin, isolation of the glands, manipulation of the upper and lower poles, suture of muscles, suture of skin, etc.
Because of these two characteristics, plethysmographic changes exhibited as sawtooth like curves. These curves might reflect the balance between two factors, the acupuncture analgesia and the traumatic stimulation of operation.
The plethysmography of finger-tip of 21 patients with thyroid operations under electroacupuncture were studied in 1975. When the plethysmograph of these patients were tested by painful stimulation, the amplitudes were decreased considerably; if the patients felt an obvious sensation of pain during operation, the amplitudes were also markedly narrowed, sometimes associated with increasing of frequency or shifting of the baseline of these waves. After treatment with meperidine or procaine, the patient became calm, the amplitudes restored with stable baseline.
There were two characteristics in plethysmography through the whole operation procedure:
1) There was a progressive rise of amplitudes after acupuncture anesthesia, but it decreased gradually from the beginning of suture of muscles till the completion of skin suture. After skin closure, the amplitude increased again slightly. The amplitudes during entire surgical operation were always higher than that before operation. It was most obvious in the cases of Grade I effectiveness and less in Grade III.
2) The amplitudes decreased at the beginning of every step of operation such as the beginning of acupuncture anesthesia, sterilization of operative field, incision of skin, isolation of the glands, manipulation of the upper and lower poles, suture of muscles, suture of skin, etc.
Because of these two characteristics, plethysmographic changes exhibited as sawtooth like curves. These curves might reflect the balance between two factors, the acupuncture analgesia and the traumatic stimulation of operation.
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