Table 1. ECG Parameters

Parameter	Measures [normal range in milliseconds (ms)]
P Wave	Depolarization of the atria
PR Interval	Time from the onset of atrial depolarization (P wave) to onset of ventricular depolarization (QRS complex) Duration of atrioventricular conduction [120 to 200]
QRS Complex	Duration of depolarization of the ventricles [<120]
QT Interval	Depolarization and repolarization of the ventricles [<420; potentially <440 in women]
RR Interval	Duration of ventricular cardiac cycle (an indication of ventricular rate)

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