We observed the S.T. I. change in 46 cases with coronary heart disea- se. 36 cases of them were treated with laser at Neiquan points bilaterlly for 10 m nutes. The rest were treated with electroacupuncture at same po- ints for samc minutes. Then

we compared the action of laser and electro- acupuncture. The results showed that the S.T. I. in 31 of 36 the cases shortened after laser at the poiuts and in 5 cases it remained unchanged or increased. The shortened cases amounted to 86.1%

PEP

ICT

and PEP/LVET reduced by 8.7%

19.6% and 8.3%

respectively. But LVET/ICT and the coefficient of heart capability increased by 13.5% and 19.56%

respectively. Before and after laser at points the difference was very remrkable (P< 0.001) The results also showed that the S.T.I. in 9 of the other 10 cases shortened after electroacupuncture for

10 minutes and in 1 case it i- ncreased. The shortened cases amounted to 90%. PEP

ICT and PEP/LVET reduced by 9. 4% 11.2% and 10.8% respectively. LVET/ICT and the coe- fficient of heart capability increased by 15.01% and 18.18%

respectively. The difference was very remarkable in the same way(P<0.001). The shortening of S.T. I. reflects the improvement of left ventricular function. Both laser and electroacupuncture almost showel similer changes in some parameters of S.T.I. in direction and range. Therefore

we infer that laser at points may have the same affecting links and mechanisms as electroacupuncture in improvement of left ventricular function.