检验医学 ›› 2013, Vol. 28 ›› Issue (5): 353-356.DOI: 10.3969/j.issn.1673-8640.2013.05.001

• 临床应用研究.论著 •    下一篇

耐亚胺培南铜绿假单胞菌金属β-内酰胺酶的检测及耐药性分析

何力志   

  1. 湖南省第二人民医院,湖南 长沙 410007
  • 收稿日期:2012-03-31 修回日期:2012-07-17 出版日期:2013-05-15 发布日期:2013-05-14
  • 作者简介:何力志,男,1973年生,学士,副主任技师,主要从事临床微生物检验工作。

The metallo-beta-lactamase detection and antibiotic resistance analysis of imipenem-resistant Pseudomonas aeruginosa

  1. The Second People′s Hospital of Hunan Province,Hunan Changsha 410007,China
  • Received:2012-03-31 Revised:2012-07-17 Online:2013-05-15 Published:2013-05-14

摘要: 目的 对耐亚胺培南铜绿假单胞菌(PA)进行金属β-内酰胺酶(MBL)的检测及药物敏感性分析,为控制院内PA感染提供依据。 方法 收集临床分离的PA 460株,筛选亚胺培南耐药株;采用组合纸片法对亚胺培南耐药菌株进行MBL表型检测,用聚合酶链反应(PCR)检测MBL 基因型别,并对PCR扩增阳性株进行测序;比较分析产与不产MBL的耐亚胺培南PA耐药谱差异,并对MBL不同基因型别菌株的耐药特征进行分析。结果 460株PA中共检出28株MBL表型阳性PA,其中IMP-1型阳性19株、VIM-2 型阳性2株。随机选取 1 例 IMP-1型和 VIM-2型扩增阳性的菌株进行测序,结果与GenBank 注册号AY1686359和AF191564 相同;产 MBL 株对美罗培南耐药率为95.2%,显著高于非产 MBL 株(73.7%,P<0.05)。产 MBL 菌株对其他抗菌药物的耐药率均高于非产MBL 株,但差异无统计学意义(P>0.05);耐亚胺培南PA产MBL的基因型别不同,耐药性也不同。结论 本研究分离的产MBL PA以 IMP-1 型为主,对临床常用的多种抗菌药物具有高度耐药性,应加强对产酶株的检测和监控,防止耐药性的传播和流行;同时,临床应加强病原学检测,尽可能根据药物敏感性结果选择药物,以达到最佳抗菌效果。

关键词: 铜绿假单胞菌, 金属 β- 内酰胺酶, 耐药分析

Abstract: Objective To analyze the antibiotic susceptibility of metallo-beta-lactamase (MBL) of imipenem- resistant Pseudomonas aeruginosa(PA),and provide the reference for nosocomial infection prevention. Methods A total of 460 PA were isolated and collected from 2009 to 2011,and the imipenem-resistant isolates were screened. With the combination of disk diffusion method,the MBL phenotype of imipenem-resistant isolates was detected. The MBL genotype was detected by polymerase chain reaction (PCR). The positive isolates amplified by PCR were sequenced. The antibiotic resistance of MBL-producing isolates of imipenem-resistant PA was compared with that of non MBL-producing isolates. The antibiotic resistance characteristics of the different genotypes of MBL-producing isolates were analyzed. Results In 460 PA,28 MBL-producing isolates were identified. The 19 isolates were IMP-1 type,and 2 isolates were VIM-2 type by PCR. The 1 isolate of IMP-1 type and 1 isolate of VIM-2 type were selected randomly and sequenced. GenBank accessions were No. AY1686359 and AF191564,respectively. The resistance rate to meropenem of MBL-producing isolates was 95.2%,which was higher than that of non MBL-producing isolates(73.7%, P<0.05). The resistance rates to other antibiotics of MBL-producing isolates were higher than those of non MBL-producing isolates,but the difference was not statistically significant (P>0.05). The genotypes of MBL-producing isolates in imipenem-resistant PA were different,and the antibiotic resistances were also different. Conclusions The main genotype of MBL-producing isolates in PA is IMP-1 type. These isolates have strong antibiotic resistance to a lot of antibiotics commonly used in clinic. The epidemiology surveillance of the MBL-producing isolates must be strengthened to prevent and control the resistance spread. Simultaneously,clinical antibiotics should be used according to the antibiotic susceptibility tests.

Key words: Pseudomonas aeruginosa, Metallo-beta-lactamase, Antibiotic resistance analysis