10. Patients with a history of clinically significant atrial and/or ventricular arrhythmias including but not limited to: atrial fibrillation, ventricular tachycardia, heart block or greater than or equal to age 60 with an left ventricular ejection fraction (LVEF) of less than 45 percent on cardiac evaluation (echocardiogram, multi-gated acquisition scan (MUGA), etc.) will be excluded.