To compare the influence of various frequencies of stimulation on one particular acupuncture site on the effect of electroacupuncture anesthesia in thyroidectomies

we used Hegu and Neiguan sites in our 150 cases

us- ing 200-500/min

2

000-5

000/min and 50

000-90.000/min in 3 series of 50 cases each to observe the anesthetic effect of the various frequencies. Our results showed that all the three series using the various frequencies showed comparatively good anesthetic effect

without any significant diff- erence. The effect of electroacupuncture anesthesia may be influenced by var- ious factors

but the duration of surgery is significantly correlated. The shorter the duration of operation

the better will be the effect. Converse- ly

if the operation is prolonged

the effect will be poor. We believe that the fatigue of the patients with their necks extended backward too long was the cause of lowered effect of elecroacupuncture anesthesia in thyro- idectomy.