What is the normal duration range of a P-R interval on an ECG?

The P-R interval on an ECG measures the time taken for electrical impulses to travel from the atria to the ventricles, encompassing both the P wave (atrial depolarization) and the delay at the AV node. The normal duration of the P-R interval is crucial for determining the conduction of impulses within the heart.

A normal P-R interval ranges from 0.12 to 0.20 seconds. This duration indicates that the impulse is taking an appropriate amount of time to traverse through the atrioventricular (AV) node and into the ventricles, allowing for proper cardiac function. If this interval is too short or too long, it can indicate various types of heart block or other conduction abnormalities.

The other ranges presented do not align with the standard definition of a normal P-R interval. A shorter range, like 0.08-0.12 seconds, suggests faster conduction that may not allow for proper ventricular filling. The range of 0.10-0.15 seconds is too narrow and does not encompass the full normal variation. Lastly, the range of 0.15-0.25 seconds extends beyond the standard upper limit, indicating potential pathology or conduction delay. Therefore, the specified range of 0.12