Calibration of AlgoRithm for Detection of Cardiac Decompensation Via Parametric Objects (CARDCOP)

Inclusion Criteria: * Age ≥ 18 years * Patient diagnosed with chronic heart failure, confirmed by a cardiologist/cardio-geriatrician (regardless of the type and etiology of the disease), meeting at least one of the following two conditions: * Hospitalization in the past 12 months for a heart failure exacerbation. * NYHA class II to IV (New York Heart Association) at the time of inclusion, with elevated natriuretic peptide levels (BNP \> 100 pg/mL or NT-proBNP \> 1000 pg/mL). * French speaking patient * Patient equipped with a smartphone, computer, or tablet with internet/cellular access (of with the help of a caregiver) * Patient affiliated with a social security scheme Exclusion Criteria: * Patient undergoing dialysis for renal failure * Patient who has received or is scheduled to receive a heart transplant or circulatory assistance within the next 12 months * Patient with a left ventricular ejection fraction ≥ 50% (for non-diastolic heart failure) * Obese patient with a body mass index ≥ 40 kg/m² * Patient with severe aortic stenosis who is contraindicated for surgery or TAVI * Patient with a life expectancy of \< 1 year due to a condition other than heart failure (cancer, cirrhosis, respiratory failure, etc.) * Patient already benefiting from a telemonitoring device * Physical or psychological inability (dementia, schizophrenia, substance-related disorder) of the patient or caregiver to use the digital data collection device, as judged by the physician * Patient refusal to allow the transmission of the data necessary for monitoring the effective use of the device and obtaining individualized or national real-world usage results * Patient under guardianship, curatorship, or any other administrative or judicial measure restricting rights and freedoms * Patient unable to wear the watch for the duration of the study due to skin conditions