AMBER-HFpEF: Assessment of CK-4021586 in a Multi-Center, Blinded Evaluation of Safety and Tolerability Results in HFpEF

Open to people ages 40-85

• Males and females ≥ 40 years and ≤ 85 years of age at screening.
• Diagnosed with HF with NYHA functional class II or III.
• Screening echocardiography with LVEF ≥ 60%.
• Screening NT-proBNP ≥ 300 pg/mL for participants in sinus rhythm and ≥ 900 pg/mL for participants with comorbid atrial fibrillation or flutter.
• Body mass index < 40 kg/m2.
• Participants on beta-blockers, angiotensin-converting enzyme (ACE)/angiotensin II receptor blocker (ARB) or angiotensin receptor/neprilysin inhibitor (ARNI), or sodium-glucose contransporter-2 (SGLT2)-inhibitors must be on stable doses for more than 4 weeks prior to screening.
• Participants on a glucagon-like peptide-1 (GLP-1) agonist must be on a stable dose for more than 24 weeks prior to screening with no anticipated plans to change dose during this study.

• History or evidence of any other clinically significant disorder, malignancy, active infection, other condition, or disease that, in the opinion of the investigator or the Medical Monitor, would pose a risk to patient safety or interfere with the study evaluation, procedures, or completion.
• Other protocol-defined Inclusion/Exclusion criteria apply.