Inclusion Criteria:  Age >18 Admission with any infection or sepsis Transient AF Under general medicine Can be anticoagulated or not Sinus rhythm at discharge or point of Zio patch placement  Exclusion Criteria:  Previous history of AF or paroxysmal AF Age less than 18 years Pregnancy Active and known malignancy Recent cardiac or non-cardiac surgery (3 months) Recent myocardial infarction (3 months) Individuals with skin allergies to plasters and adhesive devices Chest wall deformity, skin condition over sticker site History of thyroid disease Current alcohol intake above recommended limits Already has a cardiac monitor or pacemaker inserted Known contraindication for anticoagulation therapy Patients who lack capacity or have an estimated life expectancy < 1 year