Intensive Prevention Program After Decompensated Heart Failure

Inclusion Criteria: * Hospitalization due to symptomatic HF NYHA II-IV, defined according to valid international guidelines, including signs of congestion, ejection fraction ≤40%, elevated NTproBNP * Age 18 - 80 years * Life expectancy \> 2 years * Access to internet, physical and mental ability and consent to participate in a HFN-guided web-based prevention program Exclusion Criteria: * Persistent NYHA IV at discharge * Reversible cause of heart failure (such as tachycardiomyopathy, acute myocarditis, pacemaker-induced HF, etc.) * Ejection fraction \>40% (HFmrEF, HFpEF) * Patient refusal or inability to give informed consent * Participation in another trial * Exercise limitations due to clinical conditions not related to HF, e.g. disabling orthopedic, rheumatological, hematooncological or neurological diseases (such as disabling stroke), severe lung diseases (such as COLD GOLD IV) * Any major non-cardiac condition that would adversely affect survival during the duration of the study, e.g. malignant comorbidities with prognosis \< 2 years or other severe comorbidities (such as end-stage liver cirrhosis) with prognosis \< 2 years * Inability to cooperate with the protocol, e.g. chronic active drug and/or alcohol abuse, severe mental disorders (such as dementia), deafness or severe language barrier (with no sufficient options for translation), inability to come to the study visits for endpoint assessment