Intracardiac Echocardiography-Guided Cavotricuspid Isthmus Ablation With a Circular-Shaped Pulsed Field Ablation Catheter

This study is evaluating a new technique for a heart procedure called cavotricuspid isthmus (CTI) ablation, which is used to treat a type of heart rhythm problem called atrial flutter. The new approach uses intracardiac echocardiography (an ultrasound camera inside the heart) and a new pulsed field ablation catheter to guide the procedure more precisely. **You may be eligible if:** - You are 18 years or older - You have been diagnosed with paroxysmal or persistent atrial fibrillation - You are scheduled for CTI ablation (a procedure to correct heart rhythm) - You are willing and able to give written informed consent **You may NOT be eligible if:** - You have had a previous CTI ablation - You have a significant heart defect or structural heart abnormality affecting the procedure area - You have a blood clot inside your heart - You are pregnant or breastfeeding - You have severe kidney or liver problems - You have an active infection or sepsis - Your life expectancy is less than 12 months Talk to your doctor to see if this trial is right for you.