- Exclusion criteria for screening and baseline ECG (a single repeat is allowed for eligibility determination): Heart rate <40 and >100 beats per minute; PR Interval <120 and >220 milliseconds (msec); QRS duration <70 and >100 msec; QT duration corrected for heart rate by Bazett's formula (QTcB) or QT duration corrected for heart rate by Fridericia's formula (QTcF) interval >450 msec; Evidence of previous myocardial infarction (does not include ST segment changes associated with repolarization); Any conduction abnormality (including but not specific to left or right complete bundle branch block, atrioventricular block [second degree or higher], Wolf Parkinson White [WPW] syndrome), sinus pauses> 3 seconds, non-sustained or sustained ventricular tachycardia (>=3 consecutive ventricular ectopic beats) or any significant arrhythmia which, in the opinion of the principal investigator and GSK medical monitor, will interfere with the safety of the individual subject.