目的 :观察低分子肝素对不稳定心绞痛 (U AP)的疗效和安全性。方法 :41例 UAP患者随机分为治疗组和对照组 ,治疗组给以低分子肝素钙 5 0 0 0 IU皮下注射 ,共 7天 ,对照给给以等量生理盐水注射 ,观察疗效及出血并发症。结果 :治疗组 U AP总有效率达 90 .5 % ,而对照组为 6 0 .5 % ,差异显著 (P<0 .0 5 ) ;无严重出血并发症。结论 :低分子肝素治疗不稳定心绞痛疗效肯定 ,安全有效 Objective: To observe the effect and safety of low molecular weight heparin on unstable angina pectoris (UAP). Methods: Forty-one patients with UAP were randomly divided into treatment group and control group. The treatment group was subcutaneously injected with low molecular weight heparin (500,000 IU) for 7 days. The control group was given normal saline injection to observe the curative effect and bleeding disease. Results: The total effective rate of UAP in the treatment group was 90.5%, while the control group was 60.5%, the difference was significant (P <0. 05); no severe bleeding complications. Conclusion: Low molecular weight heparin is effective and safe in treating unstable angina pectoris