This post-approval study (PAS) is designed to provide continued clinical evidence to confirm the long-term safety and effectiveness of the FlexAbilityTM Ablation Catheter, Sensor EnabledTM (FlexAbility SE) for the treatment of ventricular tachycardia in a post-market environment. This is a prospective, single arm, open-label, multi-center, observational study.

Inclusion Criteria:

1. Patient or legally acceptable representative or parent/guardian (as applicable) must provide written informed consent prior to any clinical investigation-related procedure
2. Subjects who have recurrent, drug-refractory, sustained MMVT with non-ischemic structural heart disease and a clinical decision has been made to use FlexAbility SE for an ablation procedure prior to enrollment in the research study
3. Refractory (i.e. not effective, not tolerated or not desired) to at least one Class I/III anti-arrhythmic medication for treatment of MMVT
4. Implanted with a market released ICD or CRT-D prior to the Index Ablation Procedure
5. Able and willing to comply with all study requirements

Exclusion Criteria:

1. Documented or known intracardiac thrombus or myxoma
2. Active systemic infection
3. History of atriotomy or ventriculotomy within 4 weeks prior to the Index Ablation Procedure
4. Patients with prosthetic valves as the catheter may damage the prosthesis
5. Unable to receive heparin or an acceptable alternative to achieve adequate anticoagulation

This clinical investigation will enroll subjects of all genders who have recurrent, drug-refractory, sustained monomorphic ventricular tachycardia in patients with non-ischemic structural heart disease.