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Inclusion criteria:

1. Participant is planned for a catheter ablation procedure to ablate either: (a) Premature ventricular complexes (PVCs); (b) Sustained monomorphic ventricular tachycardia (VT), including sustained monomorphic ischemic ventricular tachycardia (SMIVT) or sustained monomorphic non-ischemic ventricular tachycardia (SMNIVT), with one or more documented spontaneous episodes of symptomatic sustained monomorphic ventricular tachycardia within 3 months that required device therapy (shock or anti-tachycardia pacing), external cardioversion, escalated antiarrhythmic therapy, and/or hospitalization. Documented episodes will be assessed by review of electrocardiographic data.
2. Age greater than or equal to 18 years
3. Willing and capable of providing consent
4. Able and willing to comply with all pre-, post-, and follow-up testing and requirements
5. For participants with sustained monomorphic ventricular tachycardia (SMIVT or SMNIVT): participant must have an implantable cardioverter defibrillator (ICD) already implanted before the ventricular tachycardia ablation procedure, or implantation must be planned during or soon after the ablation procedure, during the same hospital admission

Exclusion criteria:

1. Incessant ventricular arrhythmia (VA) necessitating hemodynamic support prior to the ablation procedure
2. Polymorphic ventricular tachycardia, unstable ventricular tachycardia, or ventricular fibrillation (VF)
3. Idiopathic VAs
4. Suspected reversible cause of VA (example, electrolyte abnormalities, thyroid disease, drug induced arrhythmia)
5. VAs that are thought to be from channelopathies
6. Severely compromised left ventricular ejection fraction (LVEF) (less than \[\<\] 20 percentage \[%\])
7. Uncontrolled heart failure or New York Heart Association (NYHA) Class IV
8. Pre-procedure stimulation protocol anticipated to be unsafe at the time of the screening visit (e.g., hemodynamically unstable participants, participants with ventricular fibrillation), per Site Investigator discretion
9. Previous Percutaneous Coronary Intervention (PCI) / Myocardial Infarction (MI) within the past 2 months
10. Unstable angina pectoris within the past 6 months.
11. Presence of intracardiac thrombus on pre-ablation imaging
12. Presence of a condition that precludes vascular access (such as inferior vena cava \[IVC\] filter in case of anterograde approach)
13. Epicardial mapping or ablation already anticipated or planned at the time of the screening visit (that is, pre-planned epicardial approach before index VA ablation per protocol)
14. History of blood clotting, bleeding abnormalities or contraindication to anticoagulation (heparin, warfarin, or dabigatran)
15. Contraindication to contrast agents.
16. Life expectancy \< 6 months, including advanced heart failure or terminal illness (at the discretion of the Investigator)
17. Anticipated cardiac transplantation, cardiac surgery, or other major surgery within the next 6 months
18. Previous VA ablation within 6 months
19. Women who are pregnant (as evidenced by pregnancy test if pre-menopausal), lactating, or who are of child-bearing age and plan on becoming pregnant during the clinical investigation
20. Significant congenital anomaly or medical problem that in the opinion of the principal Investigator would preclude enrollment in the study
21. Presenting contra-indications for the devices used in the study, as indicated in the respective Instructions For Use (IFU)
22. Ventriculotomy or atriotomy within the preceding 8 weeks
23. Presence of myxoma, tumor, interatrial baffle or patch or other abnormality that precludes catheter introduction or manipulation
24. Prosthetic valves
25. Acute illness, active systemic infection, or sepsis
26. Current enrollment in an investigational study evaluating another device, biologic, or drug
27. Categorized as vulnerable population and requiring special treatment with respect to safeguards of well-being

• Graz, Austria
• Linz, Austria
• Aalst, Belgium
• Bruges, Belgium
• Pessac, France
• Bad Neustadt an der Saale, Germany
• Bad Oeynhausen, Germany
• München, Germany
• Bern, Switzerland
• Zurich, Switzerland