 - Cardiac Function: Patients must not have a history of ventricular fibrillation, sinus node or AV nodal disease, Wolff Parkinson White Syndrome, evidence of congestive heart failure, symptoms of coronary artery disease, serious cardiac arrhythmia, or evidence of prior myocardial infarction on EKG. The qualifying EKG must have been performed prior to study registration, but no earlier than 28 days prior to the definitive surgery. A normal cardiac stress test within 182 days prior to randomization is required for all patients over 50 years old or those with abnormal EKG or any history of cardiac disease. 