A concentration-QTc analysis of vericiguat

Introduction Vericiguat is a soluble guanylate cyclase stimulator developed for the treatment of symptomatic chronic heart failure (HF) in patients with ejection fraction less than 45% who had a previous decompensation event. A dedicated, randomised, Phase Ib, QT study of vericiguat (NCT03504982) in 74 adult patients with stable coronary artery disease demonstrated no clinically significant prolongation of the time-matched, placebo-adjusted change from baseline in the Fridericia-corrected QT interval (QTcF) after vericiguat 10 mg once daily at steady state. Purpose We conducted a concentration–QTc (C-QTc) modelling analysis, on data from the QT study, to investigate the potential effect of vericiguat on QTcF and define the vericiguat plasma concentration window within which a relevant prolongation in QTcF can be excluded. Methods In the QT study, the effect of vericiguat once daily (2.5 mg titrated to 5 mg and then to 10 mg [treatments A, B, C] over 42±9 days) on the QT interval was investigated. The positive control was a single dose of moxifloxacin 400 mg (treatment D) on Day 8 or Day 50 (7 days before the first vericiguat dose or 7 days after the last vericiguat dose), depending on the treatment sequence (Figure 1). Baseline electrocardiogram assessments were performed 24 h before the start of treatment (“baseline”) and at follow-up (“back-up baseline”; Figure 1). Time-matched, baseline- and placebo-adjusted QTcF (ΔΔQTc) mean values and 90% confidence intervals (CIs) were calculated. Two analytical approaches were used to calculate ΔΔQTc. The first one (“single baseline ΔΔQTc” approach) was data-driven, where ΔΔQTc was adjusted with placebo- and either “baseline” or “back-up baseline”. The second one (“modelled baseline ΔΔQTc”) accounted for individual baseline and placebo effects, such as diurnal time course, used linear mixed effects and integrated all individual baseline and placebo data. Calculated ΔΔQTc values were then related to observed vericiguat concentrations in the C-QTc modelling step, performed with linear mixed effects implemented in R (R, the R Foundation for Statistical Computing, version 3.2.5). Results The C-QTc modelling of ΔΔQTc calculated with the “single baseline ΔΔQTc” approach indicated a positive, but non-significant, slope (Figure 2A). The “modelled baseline ΔΔQTc” approach indicated a positive and statistically significant slope (Figure 2B). In both cases, the upper limits of the 90% CI were below the threshold of clinical relevance of 10 ms within the investigated exposure range (up to 745 μg/l). Conclusion Based on the presented analysis, a clinically meaningful QT prolongation was robustly excluded within the plasma concentration range associated with the recommended target dose of vericiguat 10 mg. The C-QTc analysis supports the conclusion of the primary study statistical analysis that administration of vericiguat between 2.5 and 10 mg is not associated with a clinically meaningful QTc prolongation. FUNDunding Acknowledgement Type of funding sources: Private company. Main funding source(s): Funding was provided by Bayer AG, Berlin, Germany and Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA Figure 1 Figure 2