Sleep-Disordered Breathing in Heart Failure - The SchlaHF-Registry

Inclusion Criteria: * Patients must be over 18 * Chronic heart failure (at least 12 weeks since diagnosis) according to the current applicable guidelines * Left ventricular systolic dysfunction (LVEF ≤ 45% by imaging method such as echocardiography, radionuclide angiography, left ventriculography, or cardiac magnetic resonance imaging) documented less than 12 weeks * NYHA class III or IV at the time of inclusion or NYHA class II with at least one hospitalisation for HF in the last 24 months * Patient is able to fully understand study information and signed informed consent Exclusion Criteria: * Life expectancy \< 1 year for diseases unrelated to chronic HF * Cardiac surgery, Percutaneous coronary intervention (PCI), Myocardial Infarction (MI) or unstable angina within 6 months * CRT-implantation (either CRT-D or CRT-P) scheduled or within 6 months * Transient ischemic attack (TIA) or Stroke within 3 months * Hemodynamically significant uncorrected primary valvular heart disease, obstructive or regurgitant, or any valvular disease expected to lead to surgery * Acute myocarditis/pericarditis within 6 months * Current CPAP or bilevel therapy