Impact of second-line drug resistance on tuberculosis treatment outcomes in the United States: MDR-TB is bad enough
OBJECTIVE: To determine the impact on outcomes of resistance to individual SLDs, we analyzed successful treatment completion and death among drug-resistant TB cases in the US national TB surveillance system, 1993–2007 (N = 195 518).
DESIGN: We defined four combinations of first-line drug (FLD) resistance based on isoniazid (INH) and rifamycin, and three patterns of SLD resistance: fluoroquinolones, injectable SLDs and other oral SLDs. We compared treatment outcomes of cases by FLD resistance, with and without each pattern of SLD resistance.
RESULTS: In all but one instance, cases with FLD resistance but no SLD resistance had better outcomes than cases with SLD resistance. Rifamycin resistance, alone or with INH, resulted in a greater decline in treatment completion and greater increase in deaths than resistance to SLDs. Among patients with multidrug-resistant TB, additional resistance to injectable SLDs was statistically significant. Outcomes were better for human immunodeficiency virus (HIV) negative than HIV-positive cases for all resistance patterns, but improved among HIV-infected cases after 1998, when highly active antiretroviral treatment became widely available.
CONCLUSION: These results suggest that the effect of rifamycin resistance may outweigh the more modest effects of resistance to specific SLDs.
Document Type: Research Article
Affiliations: Division of Tuberculosis Elimination, US Centers for Disease Control and Prevention, Atlanta, Georgia, USA
Publication date: 01 October 2012
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