What is the normal range for the PR interval measured in seconds?

The normal range for the PR interval is between 0.12 and 0.20 seconds. This interval represents the time it takes for electrical impulses to travel from the atria through the AV node and into the ventricles. Understanding this range is crucial because it indicates whether the conduction through the AV node is normal.

A PR interval shorter than 0.12 seconds may suggest a condition such as pre-excitation syndrome, while a PR interval longer than 0.20 seconds can indicate a first-degree AV block. Knowing the correct range helps paramedics and healthcare providers assess the electrical conduction system of the heart effectively and promptly detect any abnormalities during ECG interpretation.