Smartwatch and External Holter Monitoring to Detect Atrial Fibrillation in Patients With Cryptogenic Stroke

Inclusion Criteria: * Age greater to or equal to 55 years * Patients with diagnosis of cryptogenic stroke after a basic study that included neuroimaging, extra/intracranial vascular evaluation, 24-hour monitoring, and echocardiogram * Patients with acute cortical infarction with the presence of intracranial occlusion (preferably) * Modified Rankin Scale (mRS) lower to 4 Exclusion Criteria: * Diagnosis of lacunar infarction or transient ischemic attack (TIA) * Diagnosis of stroke of known source: atherothrombotic due to moderate or severe symptomatic extra/intracranial stenosis, major cardioembolic cause (atrial fibrillation, anterior or apical ventricular akinesis, causal PFO, post-AMI, flutter or mitral stenosis), unusual cause (thrombophilia, arterial dissection symptomatic, toxic) * Use of pacemakers * Circumstances that may preclude the clinical follow-up or reduce the possibilities of obtaining data to achieve the objectives of the study and/or limit contact with the investigator (for example, transfer to a social health center) * Unwillingness to the use of cardiac monitoring wearable devices * Not understanding study procedures