- Single QTc value obtained on the baseline ECG: QTc >=450 milliseconds (msec) (machine or manual overread); or QTc >=480 msec in subjects with Bundle Branch Block. If a single QTc is abnormal, then the averaged QTc values of triplicate electrocardiograms (ECGs) obtained (each separated by at least 5 min) will be utilized to determine eligibility.