Effects of the Non-Steroidal MRA Finerenone with and without Concomitant SGLT2 Inhibitor Use in Heart Failure

Background: Patients with heart failure (HF) with mildly reduced or preserved ejection fraction face heightened long-term risks of morbidity and mortality. The sodium glucose-co-transporter-2 inhibitors (SGLT2i) and the non-steroidal mineralocorticoid receptor antagonist (MRA) finerenone have both been shown to reduce the risk of cardiovascular events in this population, but the effects of their combined use are not known. Methods: FINEARTS-HF was a randomized, double-blind, placebo-controlled trial of finerenone in patients with HF and left ventricular ejection fraction (LVEF) ≥40%. Baseline SGLT2i use was a prespecified subgroup. The primary outcome was a composite of total (first and recurrent) worsening HF events and cardiovascular death. We first assessed for evidence of treatment heterogeneity based on baseline SGLT2i use. We further examined SGLT2i uptake during the trial and evaluated the treatment effects of finerenone accounting for baseline and during trial use of SGLT2i in time-varying analyses. Results: Among 6,001 participants, 817 (13.6%) were treated with an SGLT2i at baseline. During 2.6-years median follow-up, treatment with finerenone similarly reduced the risk of the primary outcome in participants treated with an SGLT2i (rate ratio 0.83; 95% confidence interval 0.60 to 1.16) and without an SGLT2i at baseline (rate ratio 0.85; 95% confidence interval 0.74 to 0.98); P interaction =0.76. In follow-up, 980 participants initiated SGLT2i, which was less frequent in the finerenone arm compared with placebo (17.7% vs. 20.1%; hazard ratio 0.86; confidence interval 0.76 to 0.97). Time-updated analyses accounting for baseline and subsequent use of SGLT2i did not meaningfully alter the treatment effects of finerenone on the primary endpoint. Conclusions: The treatment benefits of the non-steroidal MRA finerenone were observed irrespective of concomitant use of an SGLT2i. These data suggest that the combined use of SGLT2i and a non-steroidal MRA may provide additive protection against cardiovascular events in patients with HF with mildly reduced or preserved ejection fraction.