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目的：探讨达肝素钠注射后针头是否停留对预防皮下注射部位出血的实施效果。方法将心内科住院接受低分子肝素钠皮下注射治疗的患者42例,随机分为A组和B组各21例。A组注射后停留10S。B组注射后不停留，通过对照研究，观察局部的出血情况。结果 A组（试验组）患者局部出血程度均明显低于B组（对照组），p<0.01；B组出血面积大于A组。结论 A组注射方法有利于减轻低分子肝素钠皮下注射部位出血，且出血程度与注射后停留时间有关。“,”Objective To investigate the dalteparin sodium injection needle stuck on the implementation effect of subcutaneous injection site hemorrhage prevention.Method The Department of cardiology hospital 42 patients received low molecular weight heparin subcutaneous injection treatment, were randomly divided into A group and B group with 21 cases in each. Group A after injection for 10S. Group B after injection does notstop, through the control of hemorrhage, local. Result Group A (experimental group) of patients with local hemorrhage were significantly lower than B group (control group), p<0.01; B hemorrhage group is larger than the A group. Conclusion Group A injection method is beneficial to reduce the low molecular weight heparin subcutaneous injection site hemorrhage, and the degree of hemorrhage and after injection of retention time.