A Study Assessing Arrhythmia Mapping With a Multi-Electrode Mapping Catheter

This study tests a new multi-electrode catheter used during heart rhythm procedures (electrophysiology studies) to map and guide treatment of abnormal heart rhythms — including atrial fibrillation, ventricular tachycardia, and other arrhythmias. **You may be eligible if...** - You are 18 or older - You have been diagnosed with an abnormal heart rhythm (atrial fibrillation, atrial tachycardia, ventricular tachycardia, or premature ventricular contractions) - You are already scheduled for a catheter ablation procedure - You have had at least one documented episode of your arrhythmia in the past year **You may NOT be eligible if...** - Your arrhythmia is caused by a reversible factor (e.g., thyroid disease, electrolyte imbalance) - You have a very large left atrium (over 55 mm) if undergoing left-sided procedure - Your heart pumping function is very low (ejection fraction 25% or below for ventricular arrhythmias, 40% or below for atrial arrhythmias) - You have a blood clot in the heart - You cannot take blood thinners Talk to your doctor to see if this trial is right for you.