1. History of cardiac disease: congestive heart failure >NYHA class 2 or with LVEF at baseline echocardiography < 50%; active CAD (MI more than 6 months prior to study entry is allowed); cardiac arrhythmias requiring anti-arrhythmic therapy (beta blockers or digoxin are permitted) or uncontrolled hypertension (defined as blood pressure >= 160 mmHg systolic and/or >= 90 mmHG diastolic on medication).