2种方法检测热毒宁与头孢哌酮钠/舒巴坦钠对广泛耐药鲍曼不动杆菌协同作用的比较

目的观察微量肉汤棋盘稀释法与纸片扩散法检测体外环境下中药热毒宁联合头孢哌酮钠/舒巴坦钠(SCF)对广泛耐药鲍曼不动杆菌(XDR-AB)协同作用的结果,比较两者的符合性,以指导临床用药。方法筛选2015年该院住院患者感染的XDR-AB共12株,将菌株培养传代,先采用微量肉汤棋盘稀释法检测SCF和热毒宁单独及联合使用时的最低抑菌浓度(MIC),通过计算判断是否有协同作用,再使用纸片扩散法检测抑菌环直径和药物的协同作用。结果微量肉汤棋盘稀释法检测热毒宁与SCF联合用药时,与单独用药时相比,MIC均有不同程度下降,热毒宁与SCF联合用药时的抑菌浓度指数均小于或等于0.5,具有协同作用。纸片扩散法测定出热毒宁原液的抑菌环直径为10mm,不同XDR-AB菌株对SCF的抑菌环直径有所差异,其中5株为15 mm,3株为16 mm,4株为17 mm。但当热毒宁与SCF联合作用时,抑菌环直径扩大,12株也都出现了协同作用。结论体外环境下,热毒宁联合SCF对XDR-AB有很好的协同作用,2种方法结果一致,虽然纸片法更加简便,但结果判断带有一定主观性,需要有经验的人员操作。

Comparison of two methods testing synergistic action of Reduning and cefoperazone sodium/sulbactam sodium on extensive drug resistant Acinetobacter bauman

Objective To observe the results of broth dilution method and disc diffusion method to test the synergistic effect of Reduning and cefoperazone sodium / sulbactam sodium(SCF) on extensive drug resistant Acinetobacter bauman (XDR-AB) in vitro environment ,and compare their compliance to guide the clinical medication .Methods A total of 12 strains of XDR-AB from infec-tion patients in our hospital in 2015 were collected ,the strain was sub cultured .Firstly ,observe the minimum inhibitory concentra-tion (MIC) of SCF and Reduning on XDR-AB alone and in combination by broth dilution method .And then judge the synergy effects through calculation .Secondly ,the inhibition ring diameter and the synergy effects was detected using the disc diffusion meth-od .Results The MIC of Reduning and SCF in combination on XDR-AB was declined compared with them alone .The Fractional in-hibitory concentration of Reduning and SCF in combination on XDR-AB were equal or less than 0 .5 ,they had synergistic effect on XDR-AB .The inhibition ring diameter of Reduning was 10 mm tested by disk diffusion method .Different strains of XDR-AB on SCF bacteriostatic annulus diameter difference ,5 strains were 15 mm ,3 strains were 16 mm ,and 4 strains were 17 mm .Reduning and SCF appeared synergistic effect according to the inhibition ring diameter expanded when they effected on XDR -AB in combina-tion .Conclusion In vitro ,Reduning combined with SCF on XDR-AB has good synergistic effect .Compared with broth microdilution checkerboard dilution method ,disk diffusion method is more simple and convenient ,but it has a certain subjective on judging re-sults ,which is better to operate by experienced person .