- Patients with serious illness such as: significant ongoing or active infection, New York Heart Association (NYHA) Grade II or greater congestive heart failure, unstable angina (anginal symptoms at rest), new onset angina (began within the last 3 months), myocardial infarction within the past 6 months, cardiac ventricular arrhythmias requiring anti-arrhythmic therapy, cerebrovascular accident within past 3 months, or psychiatric illness that would limit compliance with the study requirements.