- Have Bazett's corrected QT (QTcB) greater than 470 msec (female) or greater than 450 msec (male), history of unexplained recurrent syncope, history of congenital long QT syndrome, family history of sudden death, or the presence in the screening electrocardiogram (ECG) of a conduction abnormality that in the opinion of the investigator would preclude safe participation in this study