Elsevier

Respiratory Medicine

Volume 131, October 2017, Pages 43-48
Respiratory Medicine

Treatment outcomes of rifampin-sparing treatment in patients with pulmonary tuberculosis with rifampin-mono-resistance or rifampin adverse events: A retrospective cohort analysis

https://doi.org/10.1016/j.rmed.2017.08.002Get rights and content
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Highlights

  • Outcomes of rifampin-sparing treatment were analyzed in patients with RMR-TB.

  • Outcomes were similar between 1st-line drug + FQ and MDR-TB regimen subgroup.

  • Shorter than 20 months of treatment duration may be considered for patients with RMR-TB.

  • The standard regimen for drug-susceptible TB was associated with worse outcomes in RMR-TB patients.

Abstract

Background

Rifampin (RIF) mono-resistant tuberculosis (RMR-TB) is a rare disease. Current guidelines recommend that RMR-TB be treated as multidrug-resistant TB (MDR-TB) but the evidence is scarce.

Methods

We conducted a retrospective cohort study on pulmonary TB patients to investigate the characteristics and outcomes of RMR-TB. The characteristics of RMR-TB were compared with those with adverse events to rifampin (RAE-TB).

Results

Forty-four RMR-TB and 29 RAE-TB patients were enrolled. RMR-TB patients showed more alcohol use, prior history of TB, and radiologically severe disease, while RAE-TB patients were older and had more comorbidities and combined extrapulmonary TB. A fluoroquinolone (FQ) was the drug most commonly added (70.5%, RMR-TB; 82.8%, RAE-TB). Median treatment duration was 453 days in RMR-TB and 371 days in RAE-TB (p = 0.001) and treatment success rates were 87.2% (34/39) and 80.0% (20/25), respectively (p = 0.586). Subanalysis of the RMR-TB group by treatment regimen (standard regimen [n = 11], standard regimen + FQ [n = 12], MDR-TB regimen [n = 21]) revealed a higher rate of radiologically severe disease in the MDR-TB subgroup, with similar treatment success rates for the subgroups (85.7% [6/7]), 91.7% [11/12], and 85.0% [17/20], respectively) despite different durations of treatment (345, 405, and 528 days, respectively). Two recurrences (33.3% [2/6]) developed only in standard regimen subgroup, suggesting that standard regimen is not enough to treat RMR-TB patients.

Conclusions

The treatment outcome of RMR-TB with 1st-line drugs + FQ was comparable to that of MDR-TB regimen. Shorter treatment duration may be considered for RMR-TB patients compared with MDR-TB patients.

Keywords

Rifampin-mono-resistance
Treatment outcomes
Tuberculosis

Abbreviations

AFB
acid-fast bacilli
DST
drug susceptibility test
DOT
directly observed treatment
FQ
fluoroquinolone
HIV
human immunodeficiency virus
IQR
interquartile range
MDR
multidrug-resistant
RAE
rifampin adverse events
RIF
rifampin
RMR
rifampin mono-resistant
TB
tuberculosis

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