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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 pacemaker site moves from beat to beat causing the P' waves to appear different and the P'R intervals to vary. 2nd degree AV heart block PR intervals. PR intervals are progressively longer until a QRS complex is dropped and then the cycle repeats. 3rd degree AV heart block PR intervals. 2nd degree AV heart block PR intervals. Some of the sinus beats are blocked in the AV node and do not reach the ventricles. The PR intervals associated with the P waves that are conducted through to the ventricles are constant.