The work was carried out further to observe if the pressor reaction induced by acupuncture would accompany the reflex reaction of cardiac he- modynamics. Experiment were done on 16 conscious rabbits. The mean bl- ood pressure and the blood flow of aortic arch and central venous pressure were recorded

and then a series of indices of cardiac hemodynamics

for example

stroke volume

heart rate

cardiac index

the stroke volume work done by left ventricle and total peripheral resistance were calculated. During stimulating "Renzhong" and "Zusanli" by repeated intermittent square wave current respectively

the presser reaction appeared

central venous pressure

stroke volume

heart rate and cardiac index did not obv- iously change

but the stroke work done by left ventricle obviously incre- ased ("Renzhong" p<0.05

"zusanli" p<0.001) and total peripheral resis- tance obviously increased

too ("Renzhong" P<0.001

"zusanli" P<0.001). After both vagus nerves were cut

but cardiac sympathetic nerves rema- ined

there was no effect on the change of cardiac hemodynamics accompa- nied by presser reaction of acupuncture. After both stellate ganglia were excised

but vagus nerves remained

acupuncture could still induce obvious presser reaction by the increase of total peripheral resistance

but could no longer induce the increase of the stroke work done by left ventricle. The change of cardiac hemodynamics induced by the stimulation of saphenous. The experimental results show that the pressor reaction of acupuncture is simply induced by the contraction of peripheral blood vessels and then the increase of total peripheral resistance. However

it can accompany the increase of contractility of cardiac muscle by exciting cardiac sympthetic nerves so as to overcome the increase of afterload and maintain the original level of cardiac output.