目的：研究人工髋关节置换术后使用低分子肝素预防深静脉血栓的安全性。

Objective: to investigate the safety of low molecular weight heparin to prevent deep venous thrombosis after primary hip replacement surgery.

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方法：对比使用肝素与使用低分子肝素在血液透析中的抗凝效果，透析效果及其副作用。

Methods Compare the effect on anticoagulant therapy, hemodialysis and the side effect from the use of heparin with those from the use of Low Molecular Weight Heparins.

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结论：预防性使用低分子肝素可以降低髋、膝关节置换术后dvt的发生，不良反应发生率低。

Conclusion: low molecular weight heparin can reduce the incidence of DVT after hip or knee replacements with a low incidence of side effect.

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