Predictors of sputum culture conversion among patients treated for multidrug-resistant tuberculosis
METHODS: Predictors of time to conversion were identified using multivariate Cox proportional hazards regression modeling. Receiver operating characteristic curves were plotted to visualize the effect of using different definitions of ‘culture conversion’ on the balance between sensitivity and specificity.
RESULTS: Overall, 1209/1416 (85%) of patients with baseline positive cultures converted in a median of 3.0 months (interquartile range 2.0–5.0). Independent predictors of less likely conversion included baseline positive smear (hazard ratio [HR] 0.60, 95%CI 0.53–0.68), resistance to pyrazinamide (HR 0.82, 95%CI 0.70–0.96), fluoroquinolones (FQs; HR 0.65, 95%CI 0.51–0.83) or thioamide (HR 0.83, 95%CI 0.71–0.96), previous use of FQs (HR 0.71, 95%CI 0.60–0.83), poor outcome of previous anti-tuberculosis treatment (HR 0.69, 95%CI 0.54–0.88) and alcoholism (HR 0.74, 95%CI 0.63–0.87). The maximum combined sensitivity (84%) and specificity (94%) in predicting treatment failure was based on lack of culture conversion at month 9 of treatment, assuming conversion is defined as five consecutive negative cultures.
CONCLUSION: Patients with identified risk factors were less likely to achieve sputum culture conversion during MDR-TB treatment.
Document Type: Research Article
Affiliations: 1: US Centers for Disease Control and Prevention, Atlanta, Georgia, USA 2: Partners In Health (Lima, Peru; Tomsk, Russian Federation; Boston, Massachusetts); Harvard Medical School, Boston, Massachusetts, USA 3: Tartu University Lung Hospital, Tartu, Estonia 4: World Health Organization, Geneva, Switzerland 5: Partners In Health (Lima, Peru; Tomsk, Russian Federation; Boston, Massachusetts) 6: Infectology Center of Latvia, TB and Lung Diseases Clinic, Riga, Latvia 7: Tropical Disease Foundation, Manila, The Philippines 8: National Institute for Health Development, Tallinn, Estonia
Publication date: 2012-10-01
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