Finding Atrial Fibrillation in Stroke - Evaluation of Enhanced and Prolonged Holter Monitoring

Inclusion Criteria: * Recent cerebral ischemia defined as stroke (sudden focal neurologic deficit lasting \> 24h consistent with the territory of a major cerebral artery and categorised as ischemic) and/or a corresponding lesion on brain imaging. * Stroke symptoms started ≤ 7 days ago. * Age ≥ 60 years. * Modified Rankin scale ≤ 2 (prior to index event). Exclusion Criteria: * Known history of atrial fibrillation/flutter or atrial fibrillation/flutter on admission ECG. * Indication for oral anticoagulation at randomisation. * Absolute contra-indication against oral anticoagulation at randomisation. * Intracerebral bleeding in medical history. * Patient scheduled for Holter-ECG or cardiac Event-Recording monitoring ≥ 48 hours. * Significant carotid artery or vertebral artery stenosis \> 50% (NASCET classification), significant intracranial artery stenosis suspicious of atherosclerotic origin or acute arterial dissection explanatory of stroke symptoms. * Implanted pacemaker device or cardioverter/defibrillator. * Life expectancy \< 1 year for reasons other than stroke (e.g. metastatic cancer). * Concomitant participation in other controlled randomised trial.