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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 time from the beginning of the P wave (atrial depolarization) to the beginning of the QRS complex (ventricular depolarization) is the PR interval. This represents the time that it takes for the electrical impulse generated in the sinus node to travel through the atria and across the AV node to the ventricles. The normal PR interval is 0.12 to 0.20 seconds or 120 to 200 milliseconds (ms). Multiple abnormalities of the PR interval can occur including prolongation (as depicted on the right), shortening of the PR interval and variation from beat to beat. These are discussed in detail in the ECG criteria review sections.