2. Patients with ischemic or non-ischemic cardiomyopathy with EF≤35%, who have been implanted within the last 2 years (initial ICD/CRT-D implants, including upgrades from pacemakers) who have NOT experienced VT/VF treated with ICD therapy (ATP or shock), AND who have ONE of the following additional criteria: BUN≥26 mg/dl or QRS>120ms or Atrial Fibrillation or NSVT documented by ECG/Holter or >500 Ventricular Premature Beats (VPBs)documented in a 24-hour Holter.