2. Active heart disease as defined by an acute myocardial infarction within the previous 6 months before starting therapy, stable or unstable angina, clinically significant arrhythmia requiring medical management, OR New York Heart Association Classification of Functional Activities. Class 3: Patient has marked limitation in activities due to symptoms, even during less-than-ordinary activity and is comfortable only at rest OR Class 4: Severe limitations. Patient experiences symptoms even while at rest.