How long is the normal duration of the PR interval in an EKG?

The normal duration of the PR interval in an EKG is between 0.12 to 0.20 seconds. The PR interval reflects the time it takes for electrical impulses to travel from the atria through the AV node to the ventricles. This interval is crucial as it indicates the integrity of the conduction pathway from the atria to the ventricles.

When measuring the PR interval, if it falls within the 0.12 to 0.20 second range, it is considered normal, suggesting that there is normal conduction through the AV node and that the electrical activity is being properly coordinated from the atria to the ventricles. Duration longer than this may indicate a first-degree AV block, while a shorter duration could suggest a pre-excitation syndrome, such as Wolff-Parkinson-White syndrome.

Recognizing the normal range of the PR interval is essential for interpreting EKG results effectively and understanding potential arrhythmias or conduction disturbances.