Dipole Density Mapping of Right and Left Atrial Supraventricular Tachycardia

Inclusion Criteria: 1. aged 18 to 75 years 2. scheduled for ablation of atypical atrial flutter or paroxysmal atrial fibrillation 3. able and willing to give informed consent Exclusion Criteria: 1. implanted prosthetic, artificial, or repaired cardiac valves in the chamber being mapped, permanent pacemaker or ICD leads in the chamber being mapped, and/or hypercoagulopathy or an inability to tolerate anticoagulation . 2. myocardial infarction within the prior two months 3. cardiac surgery within the prior three months 4. intracardiac thrombus 5. clinically significant tricuspid valve regurgitation or stenosis 6. any cerebral ischemic event in the prior six months 7. pregnant or nursing 8. currently enrolled in any other clinical investigation