检验医学 ›› 2017, Vol. 32 ›› Issue (8): 722-726.DOI: 10.3969/j.issn.1673-8640.2017.08.014

• 技术研究与评价·论著 • 上一篇    下一篇

Xpert MTB/RIF系统在结核分枝杆菌和利福平耐药性快速检测中的应用

徐东芳, 王庆   

  1. 安徽省胸科医院检验科,安徽 合肥 230022
  • 收稿日期:2016-09-05 出版日期:2017-08-30 发布日期:2017-09-01
  • 作者简介:null

    作者简介:徐东芳,女,1978年生,硕士,主管技师,主要从事耐药性结核病诊断工作。

    通信作者:王 庆 ,联系电话:0551-63615292。

  • 基金资助:
    安徽省胸科医院科研项目(TB15018)

Xpert MTB/RIF assay for the rapid determination of Mycobacterium tuberculosis and rifampin resistance

XU Dongfang, WANG Qing   

  1. Department of Clinical Laboratory,Anhui Provincial Chest Hospital,Hefei 230022,Anhui,China
  • Received:2016-09-05 Online:2017-08-30 Published:2017-09-01

摘要:

目的 探讨Xpert MTB/RIF系统在结核分枝杆菌(MTB)及利福平耐药性快速检测中的应用。方法 收集2015年4–12月在安徽省胸科医院住院的616例肺结核和可疑患者痰液或肺泡灌洗液(BALF)样本,同时进行Xpert MTB/ RIF系统、液体培养法和直接涂片法3种方法检测,以临床诊断为金标准进行统计分析。结果 Xpert MTB/ RIF系统、液体培养法和直接涂片法检测MTB的敏感性分别为39.61%(225/568)、36.44%(207/568)和17.78%(101/568),Xpert MTB/RIF系统检测的敏感性与液体培养法有较好的一致性(χ2=1.21,P>0.05),显著高于直接涂片法(χ2=66.15,P<0.05)。在对利福平耐药性的检测中,Xpert MTB/RIF系统检出菌株对利福平的耐药率为19.40%(39/201),Xpert MTB/RIF系统的敏感性和特异性分别为94.59%(35/37)和97.56%(160/164),与液体培养法药物敏感性试验相比,差异无统计学意义(χ2=0.167,P>0.05)。对所有培养阳性物进行利福平耐药基因分析,以测序法作为金标准进行rpoB耐药基因检测,Xpert MTB/RIF系统检测利福平耐药位点以Probe E(58.98%,23/39)为主,测序法以S531L和L533P(62.16%,23/37)为主,2种方法突变位点基本一致(χ2 =0.081,P>0.05)。结论 Xpert MTB/RIF系统检测MTB及利福平耐药性具有较高的临床应用价值。

关键词: 结核分枝杆菌, 利福平, 耐药, Xpert MTB/RIF系统

Abstract:

Objective To investigate Xpert MTB/RIF assay for the rapid determination of Mycobacterium tuberculosis (MTB) and rifampin resistance. Methods A total of 616 sputum or bronchoalveolar lavage fluid (BALF) samples from patients with pulmonary tuberculosis and suspected with pulmonary tuberculosis in Anhui Provincial Chest Hospital were collected from April 2015 to December 2015.Diagnostic performance of Xpert MTB/RIF assay,liquid culturing and acid-fast staining smear microscopy was evaluated,according to gold standard for statistical analysis. Results The sensitivities for MTB determination were 39.61%(225/568),36.44%(207/568)and 17.78%(101/568)for Xpert MTB/RIF assay,liquid culturing and acid-fast staining smear microscopy. There was a consistency for sensitivities between Xpert MTB/RIF assay and liquid culturing(χ2=1.21,P>0.05),and the sensitivity of Xpert MTB/RIF assay was higher than that of acid-fast staining smear microscopy(χ2=66.15,P<0.05). For rifampin resistance determinatin,the rifampin resistance rate by Xpert MTB/RIF assay was 19.40%(39/201),the sensitivity and specificity were 94.59% (35/37) and 97.56% (160/164) , and there was no statistical significance compared with liquid culturing(χ2= 0.167,P>0.05). All cultures being positive for rifampin resistance gene were performed for sequencing as the gold standard of rpoB resistance gene determination. For Xpert MTB / RIF assay,the main rifampin resistance locus was Probe E(58.98%,23/39). S531L and L533P were main in sequencing(62.16%,23/37). The 2 methods had the same mutation locus (χ2=0.081,P>0.05). Conclusions Xpert MTB/RIF assay can be used for the rapid determination of MTB and rifampin resistance.

Key words: Mycobacterium tuberculosis, Rifampin, Drug resistance, Xpert MTB / RIF assay

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