Subclinical Postoperative Atrial Fibrillation

Postoperative atrial fibrillation and atrial flutter (POAF) is the most common complication after cardiac surgery requiring intervention or prolonged hospital stay. POAF is associated with higher mortality and higher risk of thromboembolic events. However, It is yet unknown whether a now event of postoperative atrial fibrillation is an indication of a chronic arrhythmic disease - a tendency towards developing recurrent atrial fibrillation or merely a response to the stress of surgery with not recurrence. This distinction is critical to determine the appropriate therapy. Since recurred events of atrial fibrillation (Paroxysmal atrial fibrillation) are associated with long term risk for stroke and thromboembolic evens patients with PAF are treated with long term anticoagulation. Missing the long term recurrence of arrhythmia may result in under-treatment and pose a significant risk of stroke. Bio-Monitor is a subcutaneous implanted device that automatically detects arrhythmias and stores electrocardiogram (ECG) recordings. It will enable the detection of atrial fibrillation over a period of years and allow correct diagnosis and appropriate treatment. The purpose of the study is to study the long term behavior of POAF, determine the likelihood of developing paroxysmal atrial fibrillation in patients with POAF and to define the risk factors for this eventuality