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The normal PR interval is from 0.12-0.2 seconds and is measured on the EKG from the beginning of the P wave to the beginning of the QRS complex. This interval represents the onset of atrial depolarization to the onset of ventricular depolarization and consists of:
The PR interval is the time from the onset of the P wave to the start of the QRS complex. It reflects conduction through the AV node. The normal PR interval is between 120 â 200 ms duration (three to five small squares). If the PR interval is > 200 ms, first degree heart block is said to be present.