依托咪酯与七氟醚对二尖瓣置换术患者麻醉诱导期血流动力学及应激反应的影响

①目的比较依托咪酯与七氟醚对二尖瓣置换术患者麻醉诱导期血流动力学及应激反应的影响。②方法二尖瓣置换术患者40例,随机均分为2组,为依咪酯组(E组)、七氟醚组(S组)。E组采用依托咪酯静脉诱导;S组采用七氟醚吸入诱导。观测2组患者在入室后(T1)、插管即刻(T2)、气管插管后3min(T3)、气管插管后10min(T4)时的MAP、HR、SPO2、血清皮质醇(Cor)、血糖(Glu)、血乳酸(Lac)浓度。③结果 T3、T4时2组MAP比T1时显著降低(P<0.01),2组间比较,S组MAP比E组显著降低(P<0.01);T3时2组皮质醇均比T1时显著降低,E组(P<0.01)、S组(P<0.05),T4时2组皮质醇变化不明显;T3、T4时2组血糖与T1比较显著降低(P<0.05)。2组患者各时点的乳酸浓度、HR、SPO2变化无显著差异(P>0.05)。④结论依托咪酯用于二尖瓣置换术麻醉诱导,对维持循环的稳定、减轻诱导期应激反应方面优于七氟醚。

置换过程的电化学和工艺分析

本文对置换过程进行了简要的电化学分析，并较详细地讨论了影响置换过程的各工艺因素．

Recovering of copper with metallic aluminum

The cementation of copper ions from aqueous copper sulfate solutions by using spherical aluminum metal particles was examined. The effects of the experimental parameters on copper cementation were investigated and evaluated. Reaction rate increases with increasing copper concentration, reaction temperature, stirring speed and decreasing pH. It was observed that the reaction follows the first-order kinetics, and progresses according to the diffusion controlling step.