A predefined subgroup analysis of the outcomes described below will be performed in the following subgroups:~Subjects not on anticoagulation drug therapy (for a planned duration of >45 days) at discharge.~Subjects with no history of AF prior to surgery and no POAF lasting >24h in hospital.~Subjects with a CHADSVASC score ≥ 4 or a CHADSVASC score ≥ 2 with at least one additional risk factor associated with the risk of developing POAF.~additional risk factors include:~chronic obstructive pulmonary disease~sleep apnea~impaired renal function~left atrial enlargement~elevated body mass index~combined CABG with valve repair or replacement
The objective of the study is to evaluate the clinical consequences following the detection of postoperative atrial fibrillation or flutter (POAF) using a remote heart rhythm monitoring strategy with a photoplethysmography based smartphone technology in the early postoperative period after discharge.