Objective:To study the effect of combine treatment with warfarin,low molecular weight heparin,clopidogrel and urokinase on throm in left atrium and machine valva.

• 目的:探讨华法令、低分子肝素钙、硫酸氯吡格雷和尿激酶联合治疗人工瓣膜置换术后血栓形成的疗效及安全性。