Experiments were made on 30 awaked healthy rabbits.The experimental pathological model of tachycardia was induced with continuous intravenous administration of isoproterenol through auricular vein. The ECG (Lead 11) was recorded and R-R interval measured to calculate heart rate. We observed the period and the earliest time of restoration of heart rate after tachycardia

and took these events as index of effect of acupuncture in each group. We discovered that the average heart rate was obviously slowed down in the group that was acupunctured at Neiguan

Tianquan

Shenmen and Zusanli points as compared with the control group 5 min. after stopping of drug injection. It was observed that the earliest time of tachycardia restoration in acupuncture group was shorter than in control group. Comparing the acupuncture of Neiguan

Tianquan and Shenmen points with that of Zusanli point and control group

there was significant difference statistically

but no statistical significance between stimulations on Neiguan

Tianquan and Shenmen points. These results denoted the relative specificity in the effect of acupuncture at Neiguan

Tianquan and Shenmen points in comparing with Zusanli point.