Dipole Density Mapping in Supraventricular Tachycardia (DDRAMATIC-SVT)

Inclusion Criteria

1. Be aged 18-75 years
2. Be scheduled for ablation of an SVT due to the arrhythmia being recurrent, poorly tolerated, and /or unable to be controlled with antiarrhythmic drugs.
3. Be able and willing to give informed consent

Exclusion Criteria

1. Have any of the following:

   • implanted prosthetic, artificial, or repaired cardiac valves in the chamber being mapped
   • permanent pacemaker or ICD leads in the chamber being mapped
   • hypercoagulopathy or an inability to tolerate anticoagulation during the procedure
   • Stents in the area of the pulmonary veins (Study CL-SVT-004 ONLY)
2. MI within the prior two (2) months
3. Cardiac surgery within the prior three (3) months
4. Intracardiac thrombus
5. Clinically significant tricuspid and/or mitral valve regurgitation or stenosis
6. Cerebral ischemic event (including TIA) in the prior six (6) months
7. Pregnant or nursing
8. Currently enrolled in another clinical investigation
9. Have a contraindication for transfemoral venous access (Study CL-SVT-004 ONLY)
10. Have a contraindication for transseptal left atrial access (for patients with left atrial arrhythmias) (Study CL-SVT-004 ONLY)
11. Life expectancy of less than one (1) year (Study CL-SVT-004 ONLY)
12. Any health condition that, in the Investigator's opinion, would not allow the application of the investigational device (Study CL-AF-004 ONLY)

NOTE: The additional exclusion criteria for CL-SVT-004 were not expected to alter or bias the patient selection for study enrollment. While these criteria would have been assumed by other investigators as a standard of care for safe enrollment in a clinical study, the German EC approval required the additional statements.