What does a long PR interval on an EKG suggest?

A long PR interval on an EKG is indicative of a delay in the electrical conduction from the atria to the ventricles, which is known as an atrioventricular (AV) block. The PR interval represents the time taken for the electrical impulse to travel through the atria and the conduction system that leads to the ventricles.

In cases where the PR interval exceeds the normal range (typically greater than 200 milliseconds), it signifies that there is a prolonged conduction time, which can occur in various degrees of AV block. This can be important in clinical settings as it can hint at underlying cardiac conditions or the potential for more serious arrhythmias.

Normal electrical conduction is characterized by a PR interval within the standard range, while increased myocardial oxygen demand relates to conditions such as ischemia, and ventricular hypertrophy is associated with an enlarged heart muscle but is not specifically reflected by changes in the PR interval. Thus, recognizing a long PR interval is crucial for identifying atrioventricular block and managing patient care effectively.