Protective Effect of Sasanquasaponin on Anoxia/Reoxygenation Injured Rat Myocardium and Its Mechanism of Action Effects of sasanquasaponin on injury of endothelial cells induced by hypoxia-reoxygenation and neutrophil adhesion Protective effect and pharmacological ischemic preconditioning of sasanquasaponin mediated by NO on intact rat heart