[Diagnosis value with Xpert Mtb/RIF assay for cervical tuberculous lymphadenitis]

Objective:To evaluate the accuracy of Xpert MTB/RIF assay in the diagnosis of cervical tuberculous lymphadenitis.Method:A total of 160 patients with cervical lymph node tuberculosis confirmed by pathology in Wuhan Pulmonary Hospital between January 2015 and June 2016 were enrolled. Cervical lymph node biopsy tissue specimens from these patients were collected and tested with acid-fast bacilli smear, TB-DNA assays, culture, and Xpert Mtb/RIF, respectively. The results were analyzed using SPSS 17.0 statistical software.Result:Using pathological diagnosis as the standard, the sensitivity of acid-fast bacilli smear was 8.12%(13/160), the sensitivity of TB-DNA assay was 69.38%(111/160), the sensitivity of culture was 31.88%(51/160), and the sensitivity of Xpert Mtb/RIF was 74.38%(119/160). The detection rate of multidrug-resistant lymphoid tuberculosis using a combination of Xpert Mtb/RIF, line probe assay (LPA), and culture methods was 9.38%(15/160).Conclusion:Xpert Mtb/RIF can rapidly detect cervical lymph node tuberculosis and assess rifampicin resistance. TB-DNA assay exhibited similar sensitivity as compared to Xpert Mtb/RIF and can detect both isoniazid and rifampicin resistant genes through LPA.These two methods are more effective than the traditional culture and smear methods.