Atrial Anomalies Predict Silent Atrial Fibrillation Detected by Implantable Cardiac Monitor in Cryptogenic Stroke

This study is investigating whether certain structural abnormalities in the upper chambers of the heart (the atria) — detected on standard cardiac imaging — can predict the later development of silent atrial fibrillation (AFib) in people who had a stroke or mini-stroke (TIA) with no identifiable cause. An implantable cardiac monitor (a small device placed under the skin to continuously record heart rhythm) is used to detect AFib that would otherwise go unnoticed. **You may be eligible if...** - You are 50–89 years old - You had an ischemic stroke or TIA between January 2022 and July 2023 - No cause for the stroke was found despite standard workup (no structural heart disease, no AFib detected on initial monitoring, no major artery problems in the neck) **You may NOT be eligible if...** - You have a history of hemorrhagic stroke (bleeding in the brain) - You already have a diagnosed history of atrial fibrillation or flutter - You have a permanent contraindication to an implantable cardiac monitor Talk to your doctor to see if this trial is right for you.