- history of ventricular fibrillation, sinus node or AV nodal disease, Wolff Parkinson White Syndrome, evidence of congestive heart failure, chest pain with exertion, hemodynamically significant or life threatening cardiac arrhythmia, or evidence of prior myocardial infarction on EKG. EKG must have been done within 28 days prior to registration. A normal cardiac stress test within 182 days prior to registration is required for all patients over 50 years old or those with abnormal EKG or any history of cardiac disease.