Note: Patients at increased risk for coronary artery disease or cardiac dysfunction (e.g., > 65yo, diabetes, history of hypertension, elevated LDL, first degree relative with coronary artery disease) will undergo full cardiac evaluation and will not be eligible if they demonstrate significant irreversible ischemia on stress thallium or an ejection fraction < 40%. Patients may be eligible if cardiac status is treated and improves to within eligibility criteria.