- Patients with history of myocardial infarct within 6 months before enrollment, New York Heart Association (NYHA) class II or greater heart failure or symptoms suspicious for congestive heart failure are not eligible unless a LVEF in the past 6 months is documented to be 50% or greater. Patients who have had a LVEF (performed for any reason) that is less than 50% in the past 6 months are ineligible.