3. Impaired cardiac function including any one of the following: Screening ECG with a QTc > 450 msec confirmed by central laboratory prior to enrollment to the study; Patients with congenital long QT syndrome; History of sustained ventricular tachycardia; Any history of ventricular fibrillation or torsades de pointes; Bradycardia defined as heart rate < 50 beats per minute. Patients with a pacemaker and heart rate ≥ 50 beats per minute are eligible; Patients with a myocardial infarction or unstable angina within 6 months of study entry; Congestive heart failure (NY Heart Association class III or IV);Right bundle branch block and left anterior hemiblock (bifascicular block)