The effect of metformin on culture conversion in tuberculosis patients with diabetes mellitus.
- Author:
Ye Jin LEE
1
;
Sung Koo HAN
;
Ju Hee PARK
;
Jung Kyu LEE
;
Deog Keom KIM
;
Hee Soon CHUNG
;
Eun Young HEO
Author Information
- Publication Type:Original Article
- Keywords: Metformin; Tuberculosis; Diabetes mellitus
- MeSH: Bacterial Load; Cohort Studies; Diabetes Mellitus*; Diagnosis; Humans; Metformin*; Recurrence; Renal Insufficiency, Chronic; Retrospective Studies; Sputum; Treatment Failure; Tuberculosis*
- From:The Korean Journal of Internal Medicine 2018;33(5):933-940
- CountryRepublic of Korea
- Language:English
- Abstract: 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.
