Increased risk of pulmonary and extra-pulmonary tuberculosis in patients with rheumatic diseases

SETTING: Impaired immunity in patients with rheumatic diseases can increase the risk of pulmonary tuberculosis (PTB). However, it is less clear whether rheumatic diseases affect the risk of extra-pulmonary tuberculosis (EPTB). OBJECTIVE: To investigate the risk of PTB and EPTB in patients with rheumatic diseases using a population-based database. DESIGN: From Taiwan's National Health Insurance Research Database, 8536 patients with tuberculosis (TB) were frequency-matched with 42 680 controls for sex, 10-year age group and index year. Subjects were retrospectively traced back for their first diagnosis of rheumatic diseases. The association between TB and rheumatic diseases was assessed using multivariate logistic regression analyses. RESULTS: The risk of developing PTB was significantly higher in patients with systemic lupus erythematosus (adjusted odds ratio [aOR] 4.90, P < 0.001), rheumatoid arthritis (RA) (aOR 2.00, P < 0.001) and Sjogren's syndrome (aOR 6.11, P < 0.001). In addition, the risks of developing EPTB were significantly higher in RA patients (aOR 4.67, P < 0.001), those with Sjogren's syndrome (aOR 5.94, P < 0.001), and the group comprising progressive systemic sclerosis, polymyositis or dermatomyositis (aOR 8.31, P = 0.021). CONCLUSION: Elevated risks of PTB and EPTB were associated with various rheumatic diseases. Rheumatologists should be vigilant to the possibility of TB, and particularly EPTB, in their patients.