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Aims Vericiguat reduced the primary composite outcome of cardiovascular death or heart failure (HF) hospitalization in patients with worsening HF with reduced ejection fraction (HFrEF) and a lower limit of baseline estimated glomerular filtration rate (eGFR) of 15 mL/min/1.73 m2. We evaluated the relationship between the efficacy of vericiguat and baseline and subsequent changes in renal function. Methods and results In VICTORIA, core laboratory serum creatinine was measured at baseline (n = 4956) and weeks 16, 32, and 48. Worsening renal function (WRF), defined as an increase ≥0.3 mg/dL in creatinine from baseline to week 16, was assessed via a Cox model with respect to subsequent primary events. Mean age was 69 years, 24% were female, and mean baseline eGFR was 61 mL/min/1.73 m2. During 48 weeks of treatment, the trajectories in eGFR and creatinine with vericiguat were similar to placebo (P = 0.50 and 0.18). The beneficial effects of vericiguat on the primary outcome were not influenced by baseline eGFR (interaction P = 0.48). WRF occurred in 15% of patients and was associated with worse outcomes (adjusted hazard ratio 1.28, 95% confidence interval 1.11–1.47; P, The left panel shows no differences in the change in creatinine (P = 0.18) between the vericiguat and placebo groups, as evaluated by the interaction between treatment and study visit in the model. The right panel shows a natural cubic spline plot showing that the treatment effect of vericiguat on the primary outcome was similar across the full range of estimated glomerular filtration rate (eGFR) (P = 0.23).