The purpose of this study is to demonstrate that primary prevention patients with one or more additional risk factors (1.5 prevention criteria: syncope/pre-syncope, non-sustained ventricular tachycardia (NSVT), frequent pre-ventricular contractions (PVCs), and low left ventricular ejection fraction (LVEF)) are at a similar risk of life-threatening ventricular arrhythmias (LTVA) when compared to secondary prevention patients, and would receive similar benefit from an implantable cardioverter defibrillator (ICD), or cardiac resynchronization therapy- defibrillator (CRT-D) implant.
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Time to the First Occurrence of a Ventricular Arrhythmia
Timeframe: Hazard ratio from study enrollment to approximately 4 years post-implant/enrollment (as reported in Statistical Analysis 1), and estimated 24 month VT-VF rate (as compared in the Outcome Measure table between Groups A and C).