Abnormal PR interval

What it means

An anomaly of the PR interval, which is the portion of the ECG from the onset of the P wave to the beginning of the QRS complex. A normal PR interval in adults is 0.12-0.2 seconds.

The PR interval begins at the onset of the P wave and ends at the onset of the QRS complex. This interval reflects the time the impulse takes to reach the ventricles from the sinus node. In contrast, the PR segment begins at the endpoint of the P wave and ends at the onset of the QRS complex. It reflects the conduction from the atrioventricular node, down the bundle of His and through the bundle branches to the muscle.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category