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Intervals of ECG

Image
By Dr. Ahmed

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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