[Detection of atrial fibrillation after stroke].

Approximately every fourth stroke results from cardiac embolism. Atrial fibrillation has been recognized as a common cause for thromboembolic stroke. Detection of unknown atrial fibrillation is an important clinical challenge, as anticoagulation may effectively reduce the risk of recurrent ischemic stroke. In all patients with a cryptogenic stroke 24-h Holter monitoring should be performed in addition to a standard ECG to detect paroxysmal atrial fibrillation. In addition, it is useful to pay attention to atrial fibrillation during continuous bedside ECG monitoring on the stroke unit and in pacemaker interrogation. The indication for longer ECG monitoring by implantable loop recorders may be considered individually based on the expected probability of atrial fibrillation. The potential benefit of these devices is currently being evaluated in clinical trials.