First degree atrioventricular block

What it means

Delay of conduction through the atrioventricular node, which is manifested as prolongation of the PR interval in the electrocardiogram (EKG). All atrial impulses reach the ventricles.

The conduction of the cardiac impulse through the atrioventricular node is manifested in the EKG by the PR interval, which is normally less that 200 milliseconds in adults. Normal values are age-dependent in children, but normal values are less that 160 milliseconds in young children.

Rare diseases that can present with this9

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