What is the normal PR interval time range?

The normal PR interval time range is defined as 0.12 to 0.20 seconds. This interval represents the time taken for electrical impulses to travel from the atria through the AV node to the ventricles. It reflects the period of atrial depolarization and the delay before ventricular depolarization begins, which is critical for ensuring coordinated heart contractions. Values within this range indicate proper conduction through the AV node, allowing for effective heart function. Values shorter than this might suggest issues with conduction (e.g., Wolff-Parkinson-White syndrome), while prolonged PR intervals could indicate potential heart block or delay in conduction. Understanding this range is essential for interpreting ECG readings effectively, particularly in diagnosing various cardiac conditions.