Abstract: Microwaves with a mean power density of 100 mW/cm² and 200 mW/cm² (HPM) were adopted to investigate the effects of microwave radiation on serum myocardial enzyme activity and hemodynamics in rabbits. Observations show that R and HR speed up after microwave irradiation for 5 min. BP and LVSP increased, +dp/dtm and -dp/dtm increased, LVDP and LVEDP decreased, T value decreased abnormal electrocardiogram (ECG) waveform appear convulsions during 10—15 min in 100 mW/cm² irradiation. ECG wave abnormalities, repeated convulsions irradiated by 200 mW/cm² at 5 min. LVDP decreased significantly, T decreased, +dp/dtm and -dp/dtm increased significantly at 15—20 min after microwave irradiation. After irradiation, all rabbits hemodynamics changes immediately. R, HR decreased, BP decreased, LVSP decreased gradually, +dp/dtm and -dp/dtm were significantly decreased, LVDP and LVEDP increased, the T value increases after microwave irradiation of 6 h for dynamic observation. The serum myocardial enzymes were significantly increased after irradiation. These results demonstrate that high power microwave radiation has a significant effect on rabbit cardiac function, and the effect of injury is closely related to radiation intensity.

Key words: microwave, rabbit, myocardial enzyme, cardiac hemodynamics