<qa>  What type of disease is the New York Heart Association Grade II or greater congestive heart failure- History of serious systemic disease, including myocardial infarction within the last 12 months, uncontrolled hypertension blood pressure of 160110 mmHg on medication, unstable angina within the last 12 months, New York Heart Association NYHA Grade II or greater congestive heart failure see Appendix C, unstable symptomatic arrhythmia requiring medication subjects with chronic atrial arrhythmia, i. e. atrial fibrillation or paroxysmal supraventricular tachycardia are eligible, or peripheral vascular disease Grade II or greater. 