A Study to Test Whether Vicadrostat (BI 690517) in Combination With Empagliflozin Helps People With Heart Failure and a Weak Pumping Function of the Left Side of the Heart

Inclusion criteria:

1. At least 18 years old and at least at the legal age of consent in countries where it is greater than 18 years
2. Signed and dated written informed consent in accordance with International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use - Good Clinical Practice (ICH-GCP) and local legislation prior to admission to the trial
3. Male or female participants. Women of childbearing potential (WOCBP) must be ready and able to use highly effective methods of birth control per ICH M3 (R2) that result in a low failure rate of less than 1% per year when used consistently and correctly. A list of contraception methods meeting these criteria and instructions on the duration of their use is provided in the protocol.
4. Chronic heart failure (HF) diagnosed at least 3 months before Visit 1, and in New York Heart Association (NYHA) classes II to IV at Visit 1, with left ventricular ejection fraction (LVEF) \< 40% per local reading (obtained by echocardiography, radionuclide ventriculography, invasive angiography, magnetic resonance imaging (MRI), or computed tomography (CT)).
5. Elevated N-terminal pro-brain natriuretic peptide (NT-proBNP) at Visit 1, analysed at the central laboratory
6. Treated according to best possible standard of care (SOC) (disregarding sodium-dependent glucose co-transporter 2 inhibitor (SGLT2i) and mineralocorticoid receptor antagonist (MRA)) in accordance with applicable heart failure (HF) local/international guidelines and judgement of the investigator.

Additional inclusion criteria apply.

Exclusion criteria:

1. Treatment with an MRA (e.g. spironolactone, eplerenone, finerenone) within 14 days prior to Visit 1 or requiring such treatment before randomisation or planned during the trial based on the judgment of the investigator. Treatment with an MRA should not be discontinued with the intention of study enrolment.
2. Treatment with amiloride or other potassium-sparing diuretic within 14 days prior to Visit 1 or requiring such treatment before randomisation or planned during the trial based on the judgment of the investigator.
3. Receiving the following treatments:

   * A direct renin inhibitor (e.g. aliskiren) at Visit 2
   * More than one angiotensin-converting enzyme inhibitor (ACEi), angiotensin receptor blocker (ARB) or angiotensin receptor-neprilysin inhibitor (ARNi) used simultaneously at Visit 2
   * Other aldosterone synthase inhibitors, e.g. baxdrostat at Visit 2 or planned during the trial
   * Systemic mineralocorticoid replacement therapy (e.g. fludrocortisone) at Visit 2
   * In case of acute decompensated HF:

     * i.v. inotrope, i.v. vasodilating drug (e.g. nitrate, nitroprusside), or i.v. natriuretic peptide (e.g. nesiritide, carperitide), or mechanical support (e.g. intra-aortic balloon pump, endotracheal intubation, mechanical ventilation, any ventricular assist device) within 24 hours prior to randomisation
     * i.v. diuretic with a dose that has been increased/intensified within 6 hours prior to randomisation (a stable dose of an i.v. diuretic is not exclusionary)
4. Myocardial infarction (MI), transient ischemic attack (TIA), stroke, coronary artery bypass graft surgery (CABG), heart valve surgery/intervention or any other major surgery (major according to the investigator's assessment) within 90 days prior to Visit 2, or scheduled for major elective surgery (e.g. hip replacement, CABG)
5. Percutaneous coronary intervention (PCI) or any angiography using iodinated contrast agents in the 7 days prior to Visit 2
6. Heart transplant recipient, awaiting heart transplant, or currently implanted left ventricular assist device (LVAD)
7. Known cardiomyopathy based on infiltrative diseases (e.g. amyloidosis), accumulation diseases (e.g. haemochromatosis, Fabry disease), muscular dystrophies, hypertrophic obstructive cardiomyopathy or known pericardial constriction, or cardiomyopathy with potentially reversible cause such as stress or peripartum cardiomyopathy or cardiomyopathy induced by chemotherapy within 12 months prior to Visit 1 and until Visit 2
8. Acute inflammatory heart disease, such as acute myocarditis, within 90 days preceding prior to Visit 1 and until Visit 2 Further exclusion criteria apply.