Background.
Recently, serious concerns about extensively drug‐resistant tuberculosis (XDR‐TB), which shows resistance to second‐line anti‐TB drugs in addition to isoniazid and rifampicin, have been raised. The aim of this study was to elucidate the impact of extensive drug resistance on treatment outcomes in non–human immunodeficiency virus (HIV)–infected patients with multidrug‐resistant tuberculosis (MDR‐TB).
Methods.
Patients who received the diagnosis of and treatment as having MDR‐TB at Seoul National University Hospital (Seoul, Republic of Korea) between January 1996 and December 2005 were included. The definition of XDR‐TB was TB caused by bacilli showing resistance to both isoniazid and rifampicin and also showing resistance to any fluoroquinolone and to at least 1 of the following 3 injectable anti‐TB drugs: capreomycin, kanamycin, and amikacin. To identify the impact of extensive drug resistance on treatment outcomes, univariate comparison and multiple logistic regression were performed.
Results.
A total of 211 non–HIV–infected patients with MDR‐TB were included in the final analysis. Among them, 43 patients (20.4%) had XDR‐TB. Treatment failure was observed in 19 patients (44.2%) with XDR‐TB, whereas treatment of 46 patients (27.4%) with non–XDR‐TB failed (
). The presence of extensive drug resistance (adjusted odds ratio [OR], 4.46; 95% confidence interval [CI], 1.35–14.74) and underlying comorbidity (adjusted OR, 2.62; 95% CI, 1.00–6.87) were independent risk factors for treatment failure. However, a higher level of albumin was inversely associated with treatment failure (adjusted OR, 0.87; 95% CI, 0.77–0.97).
Conclusion.
The presence of extensive drug resistance, the presence of comorbidity, and hypoalbuminemia were independent poor prognostic factors in non–HIV‐infected patients with MDR‐TB.
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