Abstract
INTRODUCTION: Many drugs for the treatment of TB prolong the QTc interval, which is associated with an increased risk of developing a life-threatening arrhythmia known as torsades de pointes. Sutezolid and delpazolid are novel oxazolidinones with demonstrated bactericidal activity. We aimed to assess the effects of sutezolid or delpazolid co-administered with bedaquiline, delamanid and moxifloxacin on the QTcF interval (Fridericia's correction). Furthermore, we developed a population pharmacodynamic model to assess the effects of drug exposure on the QTcTBT interval (TB-specific correction).
METHODS: Participants were randomized to receive standard-dose bedaquiline, delamanid and moxifloxacin with varying doses of either sutezolid (no sutezolid, 600 mg daily, 1200 mg daily, 600 mg twice daily, 800 mg twice daily) or delpazolid (no delpazolid, 400 mg daily, 800 mg daily, 1200 mg daily, 800 mg twice daily). The QTc interval was determined using weekly ECG assessments.
RESULTS: Data from 149 participants, yielding 2373 ECG observations were available for analysis. Nine participants (6.0%) experienced a Grade 3 QTcF prolongation as defined by the Common Terminology Criteria for Adverse Events v5.0. The population pharmacodynamic model predicted a 13.2 ms (95% CI: 10.9-15.3) increase of the QTcTBT in the first week of treatment, but no further increase after that. The exposure of bedaquiline's M2 metabolite was found to drive part of the QTcTBT. No exposure-response relationship was identified for the other drugs investigated.
CONCLUSIONS: The drug regimens containing standard doses of bedaquiline, delamanid and moxifloxacin, and varying doses of sutezolid or delpazolid were not found to pose a high cardiac risk in a population without further QTc-relevant risk factors. However, close monitoring of the QTc interval remains essential in patients with TB treated with combination drug therapy with known QTc-prolonging drugs.
| Original language | English |
|---|---|
| Pages (from-to) | 2305-2313 |
| Number of pages | 9 |
| Journal | Journal of Antimicrobial Chemotherapy |
| Volume | 80 |
| Issue number | 8 |
| Early online date | 4 Jul 2025 |
| DOIs | |
| Publication status | Published - Aug 2025 |
Bibliographical note
Publisher Copyright:© The Author(s) 2025.
Funding
This study was conducted by the PanACEA consortium, funded by the EDCTP2 programme (grant number TRIA2015-1102) with support from the German Ministry for Education and Research (BMBF; 01KA1701); further funding was contributed by the German Center for Infection Research (DZIF), the Swiss State Secretariat for Education, Research, and Innovation (SERI) and Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO). Otsuka provided delamanid for these studies at no cost to the consortium. We thank the participants involved in this study, all investigators, clinical nurses, laboratory personnel and trial support team. We would also like to acknowledge the members of the data safety monitoring board (Prof. Robert Horsburgh Jr, Prof. Ndeky Orio, Prof. Andrew Nunn, Prof. Gary Maartens). Further, we would like to acknowledge the team from TECRO Research for invaluable data management. This study was conducted by the PanACEA consortium, funded by the EDCTP2 programme (grant number TRIA2015-1102) with support from the German Ministry for Education and Research (BMBF; 01KA1701); further funding was contributed by the German Center for Infection Research (DZIF), the Swiss State Secretariat for Education, Research, and Innovation (SERI) and Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO). Otsuka provided delamanid for these studies at no cost to the consortium.
| Funders | Funder number |
|---|---|
| Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
| Spine Education and Research Institute | |
| Staatssekretariat für Bildung, Forschung und Innovation | |
| Deutsches Zentrum für Infektionsforschung | |
| Bundesministerium für Bildung und Forschung | 01KA1701 |
| TECRO | TRIA2015-1102 |
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