ASSURE WCD Clinical Evaluation - Conversion Efficacy Study

Inclusion Criteria: 1. Males or females, age ≥ 18 years 2. Able and willing to provide written informed consent before undergoing any study-related procedures 3. Scheduled for any of the following procedures: 1. Electrophysiology study for induction of ventricular arrhythmias 2. Non-invasive electrophysiology testing using an existing implantable defibrillator 3. Implantable cardioverter-defibrillator (ICD) replacement procedure during which induction of a ventricular arrhythmia is planned 4. Ablation of ventricular tachycardia (patients undergoing ventricular tachycardia ablation in which only a substrate modification approach is planned, with no intention of inducing a ventricular arrhythmia, should not be included) Exclusion Criteria: 1. Any condition that by the judgement of the physician investigator precludes the subject's ability to comply with the study requirements 2. Pregnancy 3. Use of mechanical circulatory support (e.g. Left Ventricular Assist Device, Total Artificial Heart, intraaortic balloon pump or Impella) 4. Documented nonchronic cardiac thrombus 5. Atrial fibrillation or atrial flutter without therapeutic systemic anticoagulation 6. Critical aortic stenosis 7. Unstable coronary artery disease (CAD) 8. Recent stroke or transient ischemic attack (TIA) 9. Hemodynamic instability 10. Currently implanted Boston Scientific S-ICD (due to location of implant relative to test system) 11. Unstable angina 12. New York Heart Association (NYHA) Class IV 13. Left Ventricular Ejection Fraction (LVEF) \< 20% 14. Any medical condition that by the judgement of the physician investigator, patient participation in this study is not in the best interest of the patient 15. History of difficulty of ventricular arrhythmia induction 16. Amiodarone use within 3 months before the study procedure