目的观察髂筋膜置管、硬脊膜外腔置管和静脉镇痛泵用于髋膝关节置换术后自控镇痛的效果。方法 150例髋膝关节置换术后镇痛患者中,髂筋膜置管组(Ⅰ组)、硬脊膜外腔置管组(Ⅱ组)和静脉镇痛泵组(Ⅲ组)各50例,记录并比较术后各时间段镇痛效...目的观察髂筋膜置管、硬脊膜外腔置管和静脉镇痛泵用于髋膝关节置换术后自控镇痛的效果。方法 150例髋膝关节置换术后镇痛患者中,髂筋膜置管组(Ⅰ组)、硬脊膜外腔置管组(Ⅱ组)和静脉镇痛泵组(Ⅲ组)各50例,记录并比较术后各时间段镇痛效果、VAS评分、按压次数(D1/D2值)及安全性和不良反应的发生。结果三组均获得满意的术后镇痛效果,但Ⅰ组和Ⅱ组各时点VAS评分均低于Ⅲ组,差异有统计学意义(P<0.05),Ⅰ组12、24、36 h VAS评分均低于Ⅱ组,差异有统计学意义(P<0.05)。术后48 h OAA/S评分比较,Ⅰ组和Ⅱ组均低于Ⅲ组,差异有统计学意义(P<0.05)。三组D1/D2值比较,差异均无统计学意义(P>0.05)。不良反应发生率Ⅰ组明显少于Ⅱ组和Ⅲ组,差异有统计学意义(P<0.05)。结论髂筋膜置管用于髋膝关节置换术后镇痛效果确切,安全可靠,不良反应少。展开更多
The property of the contact surface between geosynthetics and soil directly affects the whole structure＇s stability. The interface property is one of the most important indices for the reinforced structure. Systemati...The property of the contact surface between geosynthetics and soil directly affects the whole structure＇s stability. The interface property is one of the most important indices for the reinforced structure. Systematic direct-shear tests with large direct-shear apparatus are carded out for geobelt reinforced clay under different normal stresses and water content. A reinforcement-sand-clay layer system improving the interface behavior greatly is designed. The stress-strain relationship is investigated on the basis of the experimental results. The results show that with the increase of the normal stress, the shear strength between the clay and the reinforcement increases nonlinearly, and with the increase of the water content, the friction coefficient between the clay and the reinforcement decreases dramatically and the cohesion between the clay and the polypropylene geobelt increases initially, then decreases. There is an optimal value for the water content between the clay and the polypropylene geobelt, which is 2% lower than the optimal water content of clay compaction. This reinforcement-sand-clay layer system improves the shear strength of the interface remarkably. Therefore, the clay-sand-reinforcement layer system is a rather good design for practical use in reinforcement engineering.展开更多
文摘目的观察髂筋膜置管、硬脊膜外腔置管和静脉镇痛泵用于髋膝关节置换术后自控镇痛的效果。方法 150例髋膝关节置换术后镇痛患者中,髂筋膜置管组(Ⅰ组)、硬脊膜外腔置管组(Ⅱ组)和静脉镇痛泵组(Ⅲ组)各50例,记录并比较术后各时间段镇痛效果、VAS评分、按压次数(D1/D2值)及安全性和不良反应的发生。结果三组均获得满意的术后镇痛效果,但Ⅰ组和Ⅱ组各时点VAS评分均低于Ⅲ组,差异有统计学意义(P<0.05),Ⅰ组12、24、36 h VAS评分均低于Ⅱ组,差异有统计学意义(P<0.05)。术后48 h OAA/S评分比较,Ⅰ组和Ⅱ组均低于Ⅲ组,差异有统计学意义(P<0.05)。三组D1/D2值比较,差异均无统计学意义(P>0.05)。不良反应发生率Ⅰ组明显少于Ⅱ组和Ⅲ组,差异有统计学意义(P<0.05)。结论髂筋膜置管用于髋膝关节置换术后镇痛效果确切,安全可靠,不良反应少。
文摘The property of the contact surface between geosynthetics and soil directly affects the whole structure＇s stability. The interface property is one of the most important indices for the reinforced structure. Systematic direct-shear tests with large direct-shear apparatus are carded out for geobelt reinforced clay under different normal stresses and water content. A reinforcement-sand-clay layer system improving the interface behavior greatly is designed. The stress-strain relationship is investigated on the basis of the experimental results. The results show that with the increase of the normal stress, the shear strength between the clay and the reinforcement increases nonlinearly, and with the increase of the water content, the friction coefficient between the clay and the reinforcement decreases dramatically and the cohesion between the clay and the polypropylene geobelt increases initially, then decreases. There is an optimal value for the water content between the clay and the polypropylene geobelt, which is 2% lower than the optimal water content of clay compaction. This reinforcement-sand-clay layer system improves the shear strength of the interface remarkably. Therefore, the clay-sand-reinforcement layer system is a rather good design for practical use in reinforcement engineering.
