AI-Based Prediction of Atrial Fibrillation in ESUS Patients With ICM

Inclusion Criteria: * Patients aged 30 years or older. * Patients diagnosed with Embolic Stroke of Undetermined Source (ESUS) who have undergone or are scheduled for Implantable Cardiac Monitor (ICM) implantation. * Patients who have undergone at least one 12-lead ECG examination within 2 weeks before or after the date of ICM implantation. * Patients maintaining Sinus Rhythm on ECG at the time of enrollment. * Patients who have voluntarily signed the informed consent form. Exclusion Criteria: * Patients diagnosed with Atrial Fibrillation (AF) at least once prior to the date of enrollment. * Patients whose ICM battery status is at Elective Replacement Interval (ERI), making recording impossible. * Patients whose ECGs cannot be analyzed by the AI algorithm (SmartECG-AF) due to severe artifacts or noise, or are incompatible with digital analysis.