目的通过观察超声引导肌间沟臂从神经阻滞中注入等浓度不同容量罗哌卡因的效果,以期寻找超声引导下肌间沟臂丛阻滞的最佳容量。方法 150例拟行超声引导肌间沟臂从神经阻滞患者随机分成I、Ⅱ、Ⅲ三组,每组各50例,分别注入0.5%罗哌卡因15 ...目的通过观察超声引导肌间沟臂从神经阻滞中注入等浓度不同容量罗哌卡因的效果,以期寻找超声引导下肌间沟臂丛阻滞的最佳容量。方法 150例拟行超声引导肌间沟臂从神经阻滞患者随机分成I、Ⅱ、Ⅲ三组,每组各50例,分别注入0.5%罗哌卡因15 m L、20 m L、25 m L。观察各组起效时间,维持时间,感觉阻滞效果,肌肉松弛阻滞效果,术中呼吸、血压、心电图动态改变。结果在感觉、肌松阻滞效果及起效时间观察上,I、II、Ⅲ组比较差异无统计学意义。在维持时间方面比较:I组与Ⅱ、Ⅲ组比差异有统计学意义,Ⅱ、Ⅲ组比差异无统计学意义。观察资料表明超过20ml在臂丛阻滞麻醉中并无增强作用。低至15 m L的容量也可产生完善的麻醉效果,但会缩短麻醉维持时间。术中监护中,未发现心律失常及药物不良反应及并发症。结论罗哌卡因在肌间沟臂丛阻滞麻醉中是能较安全使用的局部麻醉药,在超声引导肌间沟臂丛神经阻滞中其最佳使用容量是20 m L。展开更多
The formation mechanism of oriented linear cutting copper sintered felt was analyzed. The influences of sintering temperature, sintering atmosphere and sintering time on the sintering formation were investigated. And ...The formation mechanism of oriented linear cutting copper sintered felt was analyzed. The influences of sintering temperature, sintering atmosphere and sintering time on the sintering formation were investigated. And the tensile mechanical properties of sintering fibers under different sintering conditions were also analyzed. The results indicate that the formation of sintered necks in the contacted area due to the materials migration of microstructures on the surfaces of fibers promotes the tight connection of oriented linear cutting copper fibers. It is also found that both sintering temperature and sintering atmosphere show important effects on the sintering formation while the influence of sintering time is not so obvious. Sintering at 800 °C for 60 min under low temperature reduction can produce sintered necks to make fibers tightly connect together and maintain the coarse microstructure on the surface of fibers, and the best tensile mechanical property can be obtained as well.展开更多
文摘目的通过观察超声引导肌间沟臂从神经阻滞中注入等浓度不同容量罗哌卡因的效果,以期寻找超声引导下肌间沟臂丛阻滞的最佳容量。方法 150例拟行超声引导肌间沟臂从神经阻滞患者随机分成I、Ⅱ、Ⅲ三组,每组各50例,分别注入0.5%罗哌卡因15 m L、20 m L、25 m L。观察各组起效时间,维持时间,感觉阻滞效果,肌肉松弛阻滞效果,术中呼吸、血压、心电图动态改变。结果在感觉、肌松阻滞效果及起效时间观察上,I、II、Ⅲ组比较差异无统计学意义。在维持时间方面比较:I组与Ⅱ、Ⅲ组比差异有统计学意义,Ⅱ、Ⅲ组比差异无统计学意义。观察资料表明超过20ml在臂丛阻滞麻醉中并无增强作用。低至15 m L的容量也可产生完善的麻醉效果,但会缩短麻醉维持时间。术中监护中,未发现心律失常及药物不良反应及并发症。结论罗哌卡因在肌间沟臂丛阻滞麻醉中是能较安全使用的局部麻醉药,在超声引导肌间沟臂丛神经阻滞中其最佳使用容量是20 m L。
基金Projects(51276069,U1301141)supported by the National Natural Science Foundation of ChinaProject(Yq2013015)supported by the Training Plan of Outstanding Young Teachers in Higher Education Institutions of Guangdong Province,China+1 种基金Project(2013J2200060)supported by the Project of Science and Technology New Star in Zhu Jiang Guangzhou City,ChinaProject(2014ZG0023)supported by the Fundamental Research Funds for the Central Universities,South China University of Technology,China
文摘The formation mechanism of oriented linear cutting copper sintered felt was analyzed. The influences of sintering temperature, sintering atmosphere and sintering time on the sintering formation were investigated. And the tensile mechanical properties of sintering fibers under different sintering conditions were also analyzed. The results indicate that the formation of sintered necks in the contacted area due to the materials migration of microstructures on the surfaces of fibers promotes the tight connection of oriented linear cutting copper fibers. It is also found that both sintering temperature and sintering atmosphere show important effects on the sintering formation while the influence of sintering time is not so obvious. Sintering at 800 °C for 60 min under low temperature reduction can produce sintered necks to make fibers tightly connect together and maintain the coarse microstructure on the surface of fibers, and the best tensile mechanical property can be obtained as well.
