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Patients with severe congestive heart failure (HF) are known to be at increased risk for life-threatening ventricular arrhythmias and sudden death. The inducibility of ventricular tachycardia (VT) is significantly higher in patients with myocardial infarction (MI) than without MI. To test the hypothesis that the increased dispersion of ventricular recovery time is a substrate for VT and ventricular...