头孢哌酮/舒巴坦对ICU常见革兰阴性杆菌抗菌活性的研究

目的 了解头孢哌酮/舒巴坦对临床常见革兰阴性杆菌的抗菌活件,比较不同浓度的头孢哌酮/舒巴坦纸片药敏试验结果的差异.方法 分离自浙江大学医学院附属第二医院、浙江省人民医院、杭州市第三人民医院和杭州市中医院的临床常见381株革兰阴性杆菌用头孢哌酮/舒巴坦含量75/75(150)和头孢哌酮/舒巴坦含量75/30(105)的药敏纸片进行K-B法药敏试验,同时用标准的琼脂稀释法检测头孢哌酮/舒巴坦的最低抑菌浓度(MIC),并采用WHONET 5.4软什和SPSS统计软件对实验结果进行分析.结果 头孢哌酮/舒巴坦105浓度和150浓度纸片法检测大肠埃希菌、肺炎克雷伯菌、铜绿假单胞菌和鲍曼不动杆菌,两种浓度纸片的符合率分别为:26.3%,79.2%,83.7%和33%,用SPSS 10.0统计k-related samples检验,P＜0.05;105浓度纸片法和琼脂稀释法针对以上4种菌的比对符合率分别为77.8%,89.6%,70.9%和77%;150浓度纸片法和琼脂稀释法的比对符合率分别为:27.3%,79.2%,61.6%和30%,两种浓度纸片法和稀释法的误差率比较,150纸片的假敏感和假中介要高于105纸片.结论 105浓度纸片法的结果更接近于作为金标准的稀释法,而目前临床药敏实验使用的150浓度的纸片法提高了细菌的敏感性.

Comparison of antibacterial activities of different concentrations of the cefoperazone-sulbactam combination disc upon commonly found gram negative bacilli

Objective To evaluate antibacterial activities of Cefoperazone-Sulbactam upon gram negative bacilli,and compare the differences in susceptibility between two different concentrations of Cefoperazone-Sulbactam combination disc.Method A total of 381 strains of commonly occurred gram negative bacilli were found from 2nd Affiliated Hospital of Zhejiang University School of Medicine,Zhejiang Provincial People's Hospital,The Third Hospital of Hangzhou and Hangzhou Hospital of Traditional Chinese Medicine respectively.Susceptibility test was conducted by K-B method using 75 μg/disc Cefoperazone plus with 75 μg/disc Sulbactam(150 disc)and 75 μg/disc Cefoperazone with 30 μg/disc Sulbactam(105 disc),respectively.Meanwhile the minimal inhibitory concentration(MIC)of Cefoperazone-Sulbactam was determined by standard agar dilution.The data were analyzed by using WHONET 5.4 and SPSS.Results Disc diffusion method was carried out to detect the antibacterial activities upon Escherichia coli,Klebsiella pneumonia,Pseudomonas aeruginosa and Acinetobacter baumannii,using 105 disc and 150 disc,respectively.The data indicated that consistency rates between these two different discs were 26.3%,79.2%,83.7%and 33%,respectively.The k-related sample test was performed by using SPSS version 10.0 and shown that the P value was less than 0.05.Upon those organisms mentioned above,the consistency rates between the antibacterial activities of 105 disc and those of agar dilution were 77.8%,89.6%,70.9%and 77%,respectively.When it was going to compare agar dilution vs.150 disc upon the susceptibility of those organisms the consistency rates were 27.3%,79.2%,61.6%and 30%,respectively.Compared with agar dilution,the error rates of those two different concentration discs revealed that the false susceptibility and false intermediate of 105 disc were higher than those of 105 disc.ConclusionsThe results of susceptibility test showed that 105 disc was more close to agar dilution than that of 150 disc.However,the 150 disc used in clinic led to increase in sensitivity of susceptibility test to organisms.