Standard Drug Therapy vs. Implanted Defibrillator for Primary Prevention of Sudden Cardiac Death

Inclusion Criteria: * documented chronic coronary heart disease (prior MI and/or angiographically documented CAD), \> 40 days post the most recent MI; * LVEF \< 40% (by MUGA) and NYHA functional class II or III at time of assessment OR LVEF ≤ 35 % (by MUGA) and NYHA functional class I, II or III at time of assessment * Judged to have a reasonable expectation of survival with a good functional status for more than 1 year, as well as receiving optimum, guideline recommended therapy for coronary artery disease and heart failure (or demonstrated intolerance or contraindications to such therapy). * Age ≥ 18 years; no upper age limitation. Exclusion Criteria: * Prior cardiac arrest, sustained VT or VF, or unexplained syncope. * Attempted VT / VF induction at electrophysiological study. * Need for a cardiac resynchronization therapy (CRT) device. * Enrollment in another interventional trial.