Relationship between Fibrinogenemia and Severity of Coronary Heart Disease Effects of different doses of carvedilol on the prevention of left ventricular remodeling following rat coronary microembolization 纤维蛋白原与冠状动脉病变严重程度相关性临床研究不同剂量卡维地洛对大鼠冠状动脉微栓塞后心室重塑的影响