ContriBution of Digital RemOte MoniToring to IMPROVing The Effectiveness of Treatment in Patients With Chronic Heart Failure With Low Ejection Fraction

Inclusion Criteria: * Age \> 18 and \< 85 years * HFrEF diagnosed according to 2020 Clinical practice guidelines for Chronic heart failure of Russian Society of Cardiology (RSC) * Hospital admission within the 72 hours prior to Screening for acute heart failure with dyspnea at rest and pulmonary congestion on chest X-ray, and other signs and/or symptoms of heart failure such as edema and/or positive rales on auscultation. * Stable condition at the time of discharge from the hospital * All measures within 24 hours prior to Randomization of systolic blood pressure ≥ 100 mmHg, and of heart rate ≥ 60 bpm. * All measures within 24 hours prior to Randomization of serum potassium ≤ 5.0 mmol/L. * At the moment of Randomization either (a) \<= ½ the optimal dose of ACEi/ARB/ARNi (see Table) prescribed, no beta-blocker prescribed, and \<= ½ the optimal dose of MRA prescribed or (b) no ACEi/ARB/ARNi prescribed, \<= ½ the optimal dose of beta-blocker prescribed, and \<= ½ the optimal dose of MRA prescribed. * A smartphone with Internet access * Written informed consent to participate in the study. Non-inclusion Criteria: * Age \< 18 or \> 85 years. * Stroke or transient ischemic attack (TIA) within the 3 months prior to Screening. * Primary liver disease considered to be life threatening. * Active infection at any time during the AHF hospitalization prior to Randomization based on abnormal temperature and elevated white blood cells (WBC) or need for intravenous antibiotics. * Psychiatr…