No supraventricular arrhythmia on electrocardiogram (EKG) Grade ? ventricular arrhythmia ? months prior to Day Having clinically significant cardiac disease such as ventricular arrhythmia requiring therapy, uncontrolled hypertension or any history of symptomatic CHF Symptomatic arrhythmia or any uncontrolled arrhythmia requiring ongoing treatment. Hiistory of ventricular arrhythmia Serious arrhythmia, History or presence of sustained bradycardia (? BPM), left bundle branch block, cardiac pacemaker or ventricular arrhythmia. Note: Patients with a supraventricular arrhythmia requiring medical treatment, but with a normal ventricular rate are eligible; Absence of uncontrolled cardiac arrhythmia known uncontrolled arrhythmias (except sinus arrhythmia) in the past weeks. Subjects with clinically apparent arrhythmia or arrhythmias who are not stable on medical management within two weeks of enrollment Subjects with clinically apparent arrhythmia or arrhythmias who are not stable on medical management within two weeks of enrollment History of clinically significant (as determined by the treating physician) atrial arrhythmia or any history of ventricular arrhythmia History of heart failure or cardiac arrhythmia Patients with history of atrial arrhythmia (requiring any anti-arrhythmic therapy) or patients with any history of ventricular arrhythmia are excluded Patients requiring anti-arrhythmia cardiac medications are NOT eligible History of arrhythmia requiring pharmacological or electrical treatment Any history of ventricular arrhythmia; or Symptomatic arrhythmia Have any condition that increases the risk of abnormal ECG or cardiac arrhythmia Current unstable arrhythmia requiring treatment. Uncontrolled cardiac arrhythmia Cardiac arrhythmia requiring maintenance medication Patients must not have serious and inadequately controlled cardiac arrhythmia Serious cardiac arrhythmia requiring medication Cardiac arrhythmia not controlled with medical management Serious uncontrolled cardiac arrhythmia grade II or higher according to NYHA Significant cardiac arrhythmia History or current evidence of cardiac arrhythmia and/or conduction abnormality Serious and inadequately controlled cardiac arrhythmia Known newly diagnosed cardiac arrhythmia; patients with an arrhythmia that has been stable for at least months will be allowed to participate Cardiac arrhythmia Cardiac arrhythmia requiring medical management and/or pacemaker Any history of ventricular arrhythmia Treatment with anti arrhythmia therapy for ventricular arrhythmia < weeks prior to enrollment Symptomatic and/or serious uncontrolled arrhythmia serious cardiac arrhythmia. Uncontrolled cardiac arrhythmia Serious uncontrolled cardiac arrhythmia. Newly diagnosed cardiac arrhythmia; patients with an arrhythmia that has been stable for at least months will be allowed to participate Current, serious, clinically significant cardiac arrhythmias, defined as the existence of an absolute arrhythmia or ventricular arrythmias classified as Lown III, IV or V. Recent malignant cardiac arrhythmias all except sinus arrhythmia within weeks prior to screening Need for antiarrhythmic medical therapy for a ventricular arrhythmia Known, uncontrolled cardiac arrhythmias (except sinus arrhythmia) within the past weeks Serious and inadequately controlled cardiac arrhythmia History of heart failure or serious cardiac arrhythmia Hx of ventricular arrhythmia or symptomatic conduction abnormality within m Hx ventricular arrhythmia or symptomatic conduction abnormality within m Uncontrolled arrhythmia or symptomatic cardiac or pulmonary disease Newly diagnosed cardiac arrhythmia; patients with an arrhythmia that has been stable for at least months will be allowed to participate History of cardiac arrhythmia, controlled or uncontrolled, including ventricular and supraventricular arrhythmia Subject has any form of known cardiac arrhythmia Patient must not have serious and inadequately controlled cardiac arrhythmia History of cardiac arrhythmia requiring treatment New (< months) cardiac arrhythmia (electrocardiogram [EKG] should be performed within weeks of starting IFN gamma) Symptomatic arrhythmia or any uncontrolled arrhythmia requiring ongoing treatment. Arrhythmia requiring treatment which is not stabilized by the treatment