- Subject has an uninterpretable or abnormal screening ECG indicating a second- or third-degree atrioventricular block, or 1 or more of the following: QRS interval (ventricular depolarization) > 110 msec; a PR interval (atrioventricular conduction) > 220 msec, or QTc (corrected QT interval) of ≥ 450 msec (for male) or ≥ 470 msec (for female) or any rhythm other than sinus rhythm that is interpreted by the PI or a qualified designee to be clinically significant