检验医学 ›› 2022, Vol. 37 ›› Issue (6): 568-576.DOI: 10.3969/j.issn.1673-8640.2022.06.014

• 技术研究与评价·论著 • 上一篇    下一篇

液体培养基硝酸还原酶试验快速检测临床常用抗结核药物最小抑菌浓度和临界浓度效果评价

杜晶辉1, 黄自坤2, 刘旻3, 龚菁菁1, 王丹1, 刘基波1, 刘旭1()   

  1. 1.天津中医药大学第一附属医院 国家中医针灸临床医学研究中心检验科,天津 300193
    2.南昌大学第一附属医院检验科,江西 南昌 330006
    3.天津中医药大学第一附属医院 国家中医针灸临床医学研究中心感染疾病科,天津 300193
  • 收稿日期:2021-05-29 修回日期:2021-08-30 出版日期:2022-06-30 发布日期:2022-07-28
  • 通讯作者: 刘旭
  • 作者简介:刘旭,E-mail: tizyyfyliuxu@163.com
    杜晶辉,男,1985年生,硕士,副主任技师,主要从事临床微生物学检测工作。

Rapid determination of minimum inhibitory concentration and cut-off concentration of Mycobacterium tuberculosis by nitrate reductase assay using liquid medium

DU Jinghui1, HUANG Zikun2, LIU Min3, GONG Jingjing1, WANG Dan1, LIU Jibo1, LIU Xu1()   

  1. 1. Department of Clinical Laboratory,the First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine,the National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion,Tianjin 300193,China
    2. Department of Clinical Laboratory,the First Affiliated Hospital of Nanchang University,Nanchang 330006,Jiangxi,China
    3. Department of Infectious Diseases,the First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine,the National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion,Tianjin 300193,China
  • Received:2021-05-29 Revised:2021-08-30 Online:2022-06-30 Published:2022-07-28
  • Contact: LIU Xu

摘要:

目的 通过多中心数据评估液体培养基硝酸还原酶试验(NRA)检测多重耐药结核分枝杆菌(MDR-MTB)和广泛耐药结核分枝杆菌(XDR-MTB)的性能;并确定MDR-MTB和XDR-MTB对利福平、异烟肼、氧氟沙星、阿米卡星、卡那霉素、卷曲霉素的最小抑菌浓度(MIC)和临界浓度。方法 分3个阶段进行分析。第1阶段确定6种药物的MIC;第2阶段确定6种药物的临界浓度;第3阶段以琼脂比例法(APM)或MGIT 960法为参考方法,通过大样本量(检测730株MTB)验证液体培养基NRA法6种药物的临界浓度。比较4家参与评估的实验室验证结果的一致性和准确度。结果 液体培养基NRA法6种药物的MIC和临界浓度分别为:利福平1 mg/L和1 mg/L,异烟肼0.2 mg/L和0.2 mg/L,氧氟沙星2 mg/L和2 mg/L,阿米卡星4 mg/L和2 mg/L,卡那霉素5 mg/L和5 mg/L,卷曲霉素5 mg/L和2.5 mg/L。参与评估的实验室临界浓度验证结果具有高一致性,准确性为96.4%~100.0%。液体培养基NRA法检测时间中位数为7 d。结论 液体培养基NRA法可为资源有限的医疗机构提供一种快速、经济、操作性强的结核分枝杆菌(MTB)体外抗结核药物敏感试验的简便方法。

关键词: 结核分枝杆菌, 硝酸还原酶试验, 最小抑菌浓度, 临界浓度

Abstract:

Objective Through performing a multicenter study of nitrate reductase assay(NRA) using liquid medium for the determination of multidrug-resistant Mycobacterium tuberculosis(MDR-MTB) and extensively drug-resistant Mycobacterium tuberculosis(XDR-MTB),to evaluate the performance of this method,and to identify the minimum inhibitory concentration(MIC) and cut-off concentrations of rifampicin,isoniazid,ofloxacin,amikacin,kanamycin and capreomycin. Methods The study was divided into 3 phases. In the Phase Ⅰ,the MIC of 6 drugs was determined. Phase Ⅱ established the cut-off concentrations of the 6 drugs. In the Phase Ⅲ,the cut-off concentrations for the 6 drugs used in NRA were verified by large numbers of clinical samples [730 isolates of Mycobacterium tuberculosis(MTB)] with agar proportion method(APM) or MGIT 960 system as reference method. The consistency and accuracy of the validation results from 4 participating laboratories were compared. Results The MIC for the 6 drugs were as follows:rifampicin 1 mg/L,isoniazid 0.2 mg/L,ofloxacin 2 mg/L,amikacin 4 mg/L,kanamycin 5 mg/L,capreomycin 5 mg/L. The cut-off concentrations for the 6 drugs were as follows:rifampicin 1 mg/L,isoniazid 0.2 mg/L,ofloxacin 2 mg/L,amikacin 2 mg/L,kanamycin 5 mg/L,capreomycin 2.5 mg/L. The accuracies for rifampicin,isoniazid,ofloxacin,amikacin,kanamycin and capreomycin were 96.4%-100.0%. The median determination time of NRA was 7 d. Conclusions NRA performed in liquid medium can provide a quick,economic and convenient method for the first-line and second-line drug susceptibility testing of MTB resource-limited settings.

Key words: Mycobacterium tuberculosis, Nitrate reductase assay, Minimum inhibitory concentration, Cut-off concentration

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