The myocardial ischemia model was produced by ligating descending branches of left coronary artery anterior in anesthetized pigling. Using the methods of TTC ink double staining and the ratio of the myocardial infarction tissue to the whole ventricle was assessed. The effect of radix astragali Shengmai Granules on the experimental myocardial ischemia was evaluated by measurring the mean artery pressure (MAP)

the left ventricular contracture pressure(LVSP)

the left ventricular end diastolic pressure(LVEDP) and the heart rate(HR) etc. The results showed that the radix astragali Shengmai Granules could signifcantly reduced the myocardial ischemia limits and degree inhibited obviously the ocurrence of arrhythmia

improve signifcantly the electrophysiocal stability in the myocardial alls.