- Myocardial infarction within 6 months of enrollment; New York Heart Association (NYHA) Class III or more heart failure, uncontrolled angina, severe uncontrolled ventricular arrhythmias; arrhythmias requiring active therapy other than chronic stable atrial fibrillation; if a patient has an implanted cardiac pacemaker and is otherwise well can be enrolled onto this study after demonstrating normal ejection fraction and clearance from a cardiologist; at the time of screening any electrocardiographic abnormality has to be documented as not medically relevant by the investigator before the patient proceeds to the enrollment phase