Interest of a Hybrid Connected Watch for Cardiac Rhythm Monitoring in Post-operative Cardiac Surgery

Inclusion Criteria: * Major with an indication for conventional cardiac surgery with de novo postoperative AF onset. * Agreeing to participate in the study and having signed an informed consent. * Agreeing to undergo 12 months of postoperative monitoring. Exclusion Criteria: * Patient with pre-operative AF * Patient who does not have a smartphone compatible with the connected watch. * Patient unable to perform an ECG measurement independently. * Patient with a physical constraint to the measurement (arteriovenous fistula...) * Minors * Pregnant or breast-feeding women * Adults under guardianship, under curatorship * Patients whose life expectancy is less than 1 year * Patients participating in another therapeutic trial likely to impact the evaluation criteria of the MONHYCARD study * Contraindication to long-term anticoagulants * Patients implanted with a mechanical valve prosthesis pre-operatively or after surgery