How long is the normal PR interval?

The normal PR interval ranges from 0.12 to 0.20 seconds. This interval represents the time it takes for electrical impulses to travel from the atria to the ventricles through the atrioventricular (AV) node. A PR interval within this range indicates appropriate conduction through the AV node and a well-coordinated atrial and ventricular contraction.

If the PR interval is shorter than 0.12 seconds, it might suggest an accelerated conduction pathway, while a PR interval longer than 0.20 seconds indicates a potential delay in conduction, known as a first-degree AV block. Therefore, understanding that the normal PR interval falls between 0.12 to 0.20 seconds is crucial in assessing cardiac conduction and recognizing potential dysrhythmias.