Email Alert | RSS

Chinese Journal of Antituberculosis ›› 2020, Vol. 42 ›› Issue (8): 832-837.doi: 10.3969/j.issn.1000-6621.2020.08.010

• Original Articles • Previous Articles     Next Articles

Preliminary study on establishing the diagnostic model for smear negative tuberculosis and stage Ⅰ/Ⅱ sarcoidosis with hilar/mediastinal lymphadenopathy and positive T-SPOT.TB results

CHEN Feng-fang*, MA Jun, HUANG Jin, YIN Hong-yun, SHA Wei, YANG Guang-hong, FENG Yong-hong()   

  1. *School of Public Health, Guizhou Medical University, Key Laboratory of Environmental Pollution and Disease Control, Ministry of Education, Guiyang 550025, China
  • Received:2020-03-28 Online:2020-08-10 Published:2020-08-10
  • Contact: FENG Yong-hong E-mail:feng_yonghong@tongji.edu.cn

Abstract:

Objective To establish diagnostic models of mediastinal lymph node tuberculosis patients and stage Ⅰ/Ⅱ sarcoidosis patients, who were both positive in tuberculosis infection T lymphocyte spot (T-SPOT.TB) test and with negative sputum smear, to improve the clinical sensitivity and specificity of the differential diagnosis of the two diseases. Methods Clinical and laboratory examination data of 100 mediastinal lymph node tuberculosis and 50 stage Ⅰ/Ⅱ sarcoidosis patients diagnosed by chest CT examination and biopsy histopathology (nstage Ⅰ=8, nstage Ⅱ=42) from Shanghai Pulmonary Hospital between January 2013 and December 2018 were retrospectively analyzed, their T-SPOT.TB test were positive and were not be treated with glucocorticoid or anti-tuberculosis treatment, in a logistic regression model for differential diagnosis of the two diseases was established. The diagnostic efficiency of the model was evaluated by the area under the ROC curve (AUC), sensitivity and specificity. Results Multivariate unconditional logistic regression analysis showed that serum angiotensin-converting enzyme (SACE) (Wald χ2=5.826, P=0.016, OR (95%CI)=0.968 (0.942-0.994)), erythrocyte sedimentation rate (ESR) (Wald χ2=5.583, P=0.018, OR (95%CI)=1.036 (1.006-1.068)) and lymphocyte count (Wald χ2=4.074, P=0.044, OR (95%CI)=4.487 (1.044-19.279)) were independent factors related for the identification of mediastinal lymph node tuberculosis and stageⅠ/Ⅱ sarcoidosis. The established logistic regression model was logit (P)=-0.418-0.033×SACE+0.036×ESR+1.501×Lym. The AUC of diagnostic efficiency of the model were 0.850 (95%CI: 0.773-0.927), the optimal cut-off value was 1.307, the sensitivity was 82.4%, and specificity was 80.9%, respectively. Conclusion The diagnostic model established in this study has high sensitivity and specificity, and is auxiliary for the differentially diagnose of mediastinal lymph node tuberculosis and stageⅠ/Ⅱsarcoidosis with positive T-SPOT.TB test.

Key words: Mediastinal diseases, Tuberculosis, lymph node, Sarcoidosis, Diagnosis, differential, Logistic models, ROC curve, Evaluation studies