Tuberculosis in Systemic Lupus Erythematosus Patients

The tubercular infections (TB) are most important cause of morbidity and mortality in SLE patients worldwide and an ongoing alarming issue in developing countries. This observational study was carried out in SLE clinic of BSMMU, Bangladesh from April 2015 to March 2016 after taking ethical clearance from IRB to observe frequency and risk factors of tuberculosis in SLE patients. A total 230 consecutive SLE patients were enrolled. Patient's clinical characteristics, history of TB, SLEDAI score, cumulative doses of immunosuppressants were recorded. In clinically suspected cases tuberculin test, chest X-ray, spot and first morning sputum for AFB, Gene Xpert MTB/RIF, ADA, FNAC and tissue biopsy were requested along with routine tests. The multivariate logistic regressions were done for risk factors. Out of 230 patients TB was documented in 23 (10%) subjects. Among TB cases 16 women and 7 men. Mean age of patients was 27.56±9.3 years and mean duration of occurrence of tuberculosis after SLE diagnosis was 4.26±5.38 years. Present and past TB was observed in 10 and 13 cases respectively. Cough, night sweat, fever, anorexia were significant presenting features. Fifteen and 8 patients had pulmonary and extra pulmonary TB respectively. Organ involvement pattern was multi-lobed lungs, joint, meninges, lymph nodes, peritoneum and pleura. High disease activity disease (SLEDAI score >12), total intake of prednisolone >1000mg were risk factors of TB. Frequency of tuberculosis was high (10%) in SLE patients. Awareness including prevention of flares and judicious use of steroids might reduce the rate of TB.