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• W4367603750 abstract "Background Diagnosing extrapulmonary tuberculosis (EPTB) can be challenging because of a variety of presentations. We assessed the accuracy of the Xpert MTB/RIF assay in diagnosing EPTB in children. Methods Of the 255 children diagnosed to have tuberculosis (TB) who underwent testing by the Xpert MTB/ RIF assay at the TB clinic from December 2014 to April 2017, 182 had EPTB and were included in the study. The diagnostic accuracy, specificity and sensitivity of the Xpert assay were calculated with Mycobacterium growth indicator tube (MGIT) as a reference standard. Results Lymph node TB was present in 58 (32%) children, 37 (20%) had neurological TB, 36 (20%) had bone TB, 31 (17%) had pleural TB, 15 (8%) had abdominal TB, 2 (1%) had abscess, 2 (1%) had congenital TB and disseminated TB was seen in 1 (0.4%) child. Xpert MTB/RIF assay was positive in 84 (46.2%) patients. The sensitivity and specificity of the Xpert MTB/RIF assay were 72% and 72.04%, respectively. Compared to MGIT, a kappa coefficient of 0.44 shows moderate agreement between the Xpert assay and MGIT. The sensitivity of Xpert MTB/RIF assay in abdominal TB, bone TB, lymph node TB, neurological TB and pleural TB was 50% (15%-85%), 72.7% (15.9%- 86.9%), 80.8% (62.1%-91.5%), 75% (50.5%-90%) and 25% (4.6%-70%), respectively. The specificity of abdominal TB, bone TB, lymph node TB, neurological TB and pleural TB was 83.3% (43.7%-97%), 69.2% (42.4%- 87.3%), 55.2% (37.6%-71.6%), 85% (64%-94.8%) and 82.6% (62.9%-93%), respectively. Forty-seven (26%) patients had drug-resistant TB (DR-TB), of which 15 (8%) were rifampicin-resistant (RR), 2 (1%) were polyresistant, 14 (8%) had multi-DR (MDR), 15 (8%) had pre-extremely DR (XDR) and 1 (1%) had XDR-TB. Of the 15 patients with MDR-TB, Xpert MTB/RIF assay detected only 10 (71%) as RR (p=0.06). Of the 15 pre-XDR cases, Xpert MTB/RIF detected only 8 (53%) as RR (p=0.02). Conclusion Xpert MTB/RIF assay is useful in the diagnosis of EPTB. It shows good concordance with MGIT. However, it may be negative in patients with DR-TB." @default.
• W4367603750 created "2023-05-02" @default.
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• W4367603750 date "2023-04-28" @default.
• W4367603750 modified "2023-09-30" @default.
• W4367603750 title "Accuracy of Xpert^® MTB/RIF in diagnosing extrapulmonary tuberculosis in Indian children" @default.
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• W4367603750 doi "https://doi.org/10.25259/nmji_35_6_334" @default.
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