Protective effect and mechanism of IPQDS on acute myocardial infarction in rats Protective Effect of Panax quinquefolium 20s-proto-panaxdiolsaponins on Acute Myocardial Infarction in Dogs Ef fect of Panax quinquefolius 20S-protopanaxdiolsaponins on sympathetictransmitter and renin-angiotensin system in rats with acute myocardial infarct ion