What is considered a long PRI measurement?

A long PR interval (PRI) is indicative of a conduction delay within the heart, specifically from the atria to the ventricles. A measurement of more than 0.20 seconds is considered abnormal and suggests the presence of first-degree heart block, where there is a prolonged delay in the transmission of electrical impulses through the atrioventricular (AV) node.

In clinical practice, a PRI measurement that exceeds 0.20 seconds is often used as a cutoff to determine if the conduction time is abnormally prolonged. This is crucial for diagnosing varying degrees of AV block, allowing healthcare providers to assess the need for further evaluation or intervention. Measurements less than 0.20 seconds are typically within normal limits, reflecting normal conduction through the AV node.