Left Atrial Volume Changes Who Underwent Cardioversion and Recurrence of AF After RF Ablation in Persistent AF (SAFE-AF)

This study is examining whether changes in the size of the left atrium (an upper chamber of the heart) after cardioversion — a procedure that restores normal heart rhythm — can predict who will have their irregular heartbeat (atrial fibrillation, or AFib) return after a radiofrequency ablation procedure. The goal is to identify better markers to guide treatment decisions. **You may be eligible if...** - You have a confirmed diagnosis of persistent atrial fibrillation (AFib lasting more than 7 days but less than 6 months) - Your left atrium measured between 40 and 50 mm before cardioversion - You had a successful cardioversion (either with medication or electrical shock) to restore normal rhythm - You had at least two echocardiograms (heart ultrasounds) before and 3–6 months after cardioversion - You have provided informed consent **You may NOT be eligible if...** - You have previously had radiofrequency ablation for AFib - You have had prior cardiac surgery - You have cognitive impairment that prevents you from giving informed consent Talk to your doctor to see if this trial is right for you.