Objective To observe the effect of Danshen yin (DSY) on the myocardial ischemia and the change of related biochemical index of blood in dogs. Methods Myocardial ischemia models were induced by ligating anterior descending branch of the left coronary artery of the dogs. The range and degree of myocardial ischemia were detected respectively via epicardical electrocardiograph and nitroblue tetrazolium staining, and the change of CK and LDH in the plasma activities were measured. Results In both DSY groups and positive medicine group, ∑-ST in th...