Inclusion Criteria- No previously diagnosed atrial fibrillation.
- Acute ischemic stroke or transient ischemic attack verified by computed tomography or clinical diagnosis using the National Institute of Health Stroke Score within 14 days of enrollment.
- Ability to understand study instructions both verbal and written.
- Ability to perform and transmit ECG recordings according to study design.
Exclusion Criteria- Previously diagnosed atrial fibrillation.
- Hemorrhagic stroke
- Low compliance
- Pacemaker carrier