Inclusion Criteria- Patients diagnosed with cryptogenic stroke and/or TIA, in accordance to the TOAST (Trial of Org 10172 in Acute Stroke Treatment) classification.
Exclusion Criteria- Patients with known or newly detected AF on initial examination including 24 h Holter ECG.
- Patients on oral anticoagulants (OAC) for non-AF indications.
- Patients with strong contraindications for OAC, even if the presence of underlying AF is detected.
- Patients with atrial- or ventricular thrombi, or atheromas of the aortic arch greater than 4 mm, detected by transesophageal echocardiography.
- Patients unable to sign the informed consent or with a life expectancy due to comorbidities of less than two years.