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KMID : 0338420180330050933
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The Korean Journal of Internal Medicine
2018 Volume.33 No. 5 p.933 ~ p.940
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The effect of metformin on culture conversion in tuberculosis patients with diabetes mellitus
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Lee Ye-Jin
Han Sung-Koo
Park Ju-Hee
Lee Jung-Kyu
Kim Deog-Keom
Chung Hee-Soon
Heo Eun-Young
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Abstract
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Background/Aims: Patients with diabetes mellitus (DM) and tuberculosis (TB) have increased morbidity and a high risk of treatment failure or recurrence. It is important to manage both diseases simultaneously. Among anti-diabetic drugs, metformin inhibits intracellular growth of mycobacteria. Therefore, we examined the effects of metformin on TB treatment, especially in patients with DM.
Methods: This retrospective cohort study included patients with culture-positive pulmonary TB diagnosed between 2011 and 2012. The primary study outcome was sputum culture conversion after 2 months of treatment.
Results: Of 499 patients diagnosed with culture-positive pulmonary TB, 105 (21%) had DM at diagnosis. Among them, 62 (59.5%) were treated with metformin. Baseline characteristics, except for the presence of chronic renal disease, were not significantly different between the metformin and non-metformin groups. Metformin treatment had no significant effect on sputum culture conversion (p = 0.60) and recurrence within 1 year after TB treatment completion (p = 0.39). However, metformin improved the sputum culture conversion rate in patients with cavitary pulmonary TB, who have higher bacterial loads (odds ratio, 10.8; 95% confidence interval, 1.22 to 95.63).
Conclusions: Among cavitary pulmonary TB patients with DM, metformin can be an effective adjunctive anti-TB agent to improve sputum culture conversion after 2 months of treatment.
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KEYWORD
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Metformin, Tuberculosis, Diabetes mellitus
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