Abstract

目的 测定头孢哌酮和哌拉西林与克拉维酸、舒巴坦、三唑巴坦3种β内酰胺酶抑制剂的不同复方的最低抑菌浓度(MIC)、抗生素后效应(PAE)、β内酰胺酶抑制剂后效应(PLIE)和亚抑菌浓度后效应(PASME).方法以肉汤稀释法测定MIC;以菌落计数法测定菌落形成单位(CFU),根据CFU做生长曲线,计算PAE、PLIE、PASME.结果不同比例复方对产β内酰胺酶菌株的MIC较单方呈2~256倍的降低.无论单方还是复方均无长PAE.3种β内酰胺酶抑制剂的PLIE对于大肠埃希菌有正有负(-2.25 h~>5 h),而对于肺炎克雷伯菌均为正值(0.34 h~5.37 h).对于肺炎克雷伯菌,0.2MIC的头孢哌酮/舒巴坦(1/1)的PASME为0.32 h,0.1MIC、0.2MIC的哌拉西林/克拉维酸(8/1)的PASME分别为2.96 h、4.41 h.结论同时具有长PLIE及PASME的复方,PLIE、PASME较其半衰期在给药方案的设计中更为重要;PAE、PLIE、PASME作为重要的药效动力学参数,可应用于评价新抗菌药物的药效学和优化给药方案。

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