Low Voltage-Directed Catheter Ablation for Atrial Fibrillation

This trial is testing whether guiding a heart procedure (catheter ablation) to treat irregular heartbeat (atrial fibrillation) by targeting areas of the heart with low electrical activity (called low voltage areas) leads to better outcomes than standard treatment alone. **You may be eligible if...** - You have a type of atrial fibrillation that is not the short-burst kind (non-paroxysmal, meaning it lasts longer) - You have tried at least one heart rhythm medication and it either did not work or caused side effects you could not tolerate - You are between 18 and 85 years old - Your doctor has already recommended you have a catheter ablation procedure - Low voltage areas were found in the left side of your heart during the procedure - You are able and willing to attend all required visits **You may NOT be eligible if...** - You have short-burst (paroxysmal) atrial fibrillation - You have not tried any heart rhythm medications - You are unable to follow the study requirements Talk to your doctor to see if this trial is right for you.