Inclusion Criteria - Ischemic stroke or TIA within the last week. Sinus rhythm on the surface ECG. Age ≥ 60 years. Given written informed consent.
Exclusion Criteria - AF detected during hospitalization or earlier. Dementia or suspected non-compliance. Known cancer except c prostate with normal PSA, or basal cell carcinoma. Pacemaker or a defibrillator implanted