Excessive Supraventricular Activity and Atrial Fibrillation

This study monitors people who have an unusually high number of extra heartbeats (called supraventricular ectopic beats) to see whether they are at increased risk of developing atrial fibrillation — an irregular heart rhythm that can raise stroke risk. The goal is to better understand who needs closer follow-up or preventive treatment. **You may be eligible if...** - You have a heart monitor (Holter) recording showing 30 or more extra beats per hour, or a run of at least 20 rapid beats - You are between 70 and 89 years old **You may NOT be eligible if...** - You are under 70 or over 89 years old - You already have atrial fibrillation or atrial flutter - You are already on long-term blood thinners - You have an implanted cardiac device (such as a pacemaker) - You have severe heart failure or a very low heart pumping function (ejection fraction 30% or less) - You have severe heart valve disease Talk to your doctor to see if this trial is right for you.