Protective Effect of Panax quinquefolium 20s-proto-panaxdiolsaponins on Acute Myocardial Infarction in Dogs Protective Effect of Qi Dong Yi Xin on Acute Myocardial Infarction in Dogs Effects of Shengmai for injection on cardiogenic shock Protective effect of ginsenoside-Rb on experimental myocardial infarction in dogs