Objective:To study the dynamic changes of plasma D dimer in patients undergoing cardiac valve replacement with mechanical prosthesis, and to guide postoperative anticoagulant therapy.
目的：研究机械瓣替换术后患者血浆D-二聚体动态变化规律，以指导术后抗凝治疗。
Objective: To study biomechanical influence and relations between the elastic modulus and mechanical compatibility for prosthesis of different stiffness after replacement.
目的：研究不同刚度的股骨头假体置换后的生物力学影响及材料的弹性模量与力学相容性关系。
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