Intervals Normal duration Average Range Events in the Heart PR interval 0.18 0.12 to 0.2 Atrial depolarization and conduction through AV node QRS interval 0.08 to 0.10 Ventricular depolarization and Atrial repolarization QT interval 0.40 to 0.43 Ventricular depolarization and repolarization ST interval 0.32 Ventricular repolarization P wave Atrial depolarization
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