Ventricular rate >= 45 beats per minute; PR interval <=210msec; No pathological Q waves; QRS interval to be >= 60msec and <=120msec; The waveforms must enable the QT interval to be clearly defined; QTc interval must be < 450msec (QTcF; machine or manual reading) based on a single ECG value, or an average from three ECGs obtained over a brief recording period.