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作 者:王卫萍[1] 邵海枫[1] 范明[1] 史利宁[1] 李晓军[1]
机构地区:[1]南京军区南京总医院临床中心实验科,南京210002
出 处:《现代检验医学杂志》2009年第6期46-48,共3页Journal of Modern Laboratory Medicine
摘 要:目的探讨EDTA和巯基乙酸钠(sodium mercaptoacetic—acid,SMA)双螯合剂检测金属肛内酰胺酶(metallo—β-lactamase,MBL)的临床应用价值。方法用亚胺培南(imipenem,IPM)(10μg/片)与EDTA(744μg/片)+SMA(1.8mg/片)双纸片协同试验(double—disk synergy tests,DDSTs)分别检测14株产MBL和15株产非MBL的细菌,并与IPM—EnTA(1860μg/片),IPM-SMA(3mg/片)和头孢他啶(ceftazidime,CAZ)(30μg/片)-EDTA(744μg/片)+SMA(1.8mg/片)双纸片协同试验(DDSTs)的检测结果进行比较。结果IPM—EDTA+SMADDSTs可检测出所有产MBL的细菌,且未出现假阳性结果;而IPM—EDTA,IPM—SMA和CAZ—EDTA+SMADDSTs均存在一定比率的漏检,分剐为14.3%(2/14),7.1%(1/14)和7.1%(1/14),同时IPM—EDTA和IPM—SMADDSTs在检测非MBL均出现6.7%(1/15)的假阳性。结论IPM-EDTA+SMADDSTs是检测MBL的一种简便可靠的方法,适用于临床微生物实验室。Objective To consider the reliability of combination of the chelators EDTA and sodium mercaptoacetic-acid (SMA) to detect metallo-β-lactamases(MBLs).Methods Using IPM-EDTA(1 860/μg/piece),IPM-SMA (3 mg/piece), IPM-EDTA (744 μg/piece ) + SMA ( 1.8 mg/piece ) and CAZ-EDTA (744 μg/piece ) + SMA (1.8 mg/piece) Double-Disk Synergy Tests (DDSTs) to detect MBL in 14 isolates and non-MBLs in 15 isolates respectively. These results were compared with each other. Results IPM-EDTA + SMA DDSTs detected all MBLs, and yielded no false-positive results. Wherase IPM-EDTA, IPM-SMA and CAZ-EDTA-4- SMA DDSTs failed to detect 2 (14.3%), 1 (7.1%) and 1 (7.1%) of 14 MBL-producing strains respectively,and both of IPM-EDTA and IPM-SMA DDSTs yielded false positive results in tests with 1 of 15 (6.7%) non-MBLs-producing strains. Conclusion IPM-EDTA+SMA DDSTs is a simple and reliable method to detect metallo-β-lactamases. It is suitable for clinical microbiology laboratory.
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