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Influence of multidrug resistance on tuberculosis treatment outcomes with standardized regimens Mak A; Thomas A; Del Granado M; Zaleskis R; Mouzafarova N; Menzies DAm J Respir Crit Care Med 2008[Aug]; 178 (3): 306-12RATIONALE: Multidrug-resistant tuberculosis (TB) poses a major challenge to global TB control. We analyzed the association between estimated prevalence of initial or acquired MDR-TB, and treatment outcomes reported nationally. OBJECTIVES: We analyzed the estimated prevalence of initial or acquired MDR-TB and treatment outcomes reported nationally. METHODS: Countries were analyzed if multidrug resistance prevalence estimates were available, and if they reported outcomes for more than 250 cases treated using standardized regimens in 2003 and/or 2004. Data sources were the World Health Organization for treatment regimens, prevalence of initial multidrug resistance, and reported cases and treatment outcomes in 2003 and 2004; the Joint United Nations Programme on HIV/AIDS for HIV seroprevalence; and the World Bank for income per capita. The adjusted impact of initial multidrug resistance on initial and retreatment outcomes was estimated with weighted multivariate linear regression. MEASUREMENTS AND MAIN RESULTS: Among countries using one of two standardized initial regimens, failure rates averaged 5.0%, and relapse rates averaged 12.8% in the 20 countries where prevalence of initial multidrug resistance exceeded 3%, compared with an average of 1.6% (P < 0.0001) and 8.1% (P = 0.0002), respectively, in 83 countries where initial multidrug resistance prevalence was less than 3%. In 92 countries using one standardized retreatment regimen, failure rates were 2.7%, 3.8%, 6.2%, and 8.1% in quartiles of increasing prevalence of acquired multidrug resistance (P < 0.0001). When stratified by initial multidrug resistance prevalence, initial and retreatment outcomes in the 79 countries using the 6-month rifampin initial regimen were not significantly different from the 24 countries using the 2-month rifampin initial regimen. CONCLUSIONS: Currently recommended standardized TB initial and retreatment regimens should be reevaluated in countries where prevalence of initial multidrug resistance exceeds 3%, in view of poor treatment outcomes.|*Global Health[MESH]|Antibiotics, Antitubercular/*pharmacology[MESH]|Clinical Protocols[MESH]|Drug Therapy, Combination[MESH]|Humans[MESH]|Mycobacterium tuberculosis/*drug effects[MESH]|Practice Guidelines as Topic[MESH]|Secondary Prevention[MESH]|Treatment Failure[MESH]|Treatment Outcome[MESH]|Tuberculosis, Multidrug-Resistant/*diagnosis/*drug therapy[MESH] |