Impact of pyrazinamide resistance on multidrug-resistant tuberculosis in Karakalpakstan, Uzbekistan
OBJECTIVE: To investigate the association between PZA susceptibility and MDR-TB treatment outcome among patients treated with a PZA-containing regimen and whether the duration of the intensive phase of the PZA-containing regimen affected treatment outcome.
DESIGN: We conducted a retrospective cohort study including all eligible MDR-TB patients starting treatment in 2003–2013 in the TB programme in Karakalpakstan, Uzbekistan. PZA drug susceptibility testing (DST) using liquid culture was performed, and outcomes were classified according to the WHO 2013 definitions.
RESULTS: Of 2446 MDR-TB patients included, 832 (34.0%) had an available baseline PZA DST result, 612 (73.6%) of whom were PZA-resistant. We found no association between treatment success and PZA susceptibility (adjusted odds ratio [aOR] 0.86, 95%CI 0.51–1.44, P = 0.6) in patients treated with PZA. Furthermore, among patients with no baseline PZA DST result, no evidence was seen of an association between treatment success and PZA treatment duration (aOR 0.86, 95%CI 0.49–1.51, P = 0.6).
CONCLUSION: Treatment of MDR-TB with a standard PZA regimen does not appear to improve treatment outcomes, regardless of PZA susceptibility or duration of treatment.
Document Type: Research Article
Affiliations: 1: London School of Hygiene & Tropical Medicine, London, UK 2: Ministry of Health, Nukus 3: Ministry of Health, Tashkent, Uzbekistan 4: Medécins Sans Frontières, Manson Unit, London, UK 5: University of British Columbia, Vancouver, British Columbia, Canada
Publication date: May 1, 2018
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