What does a PR segment represent?

A PR segment represents the period of time in an electrocardiogram (ECG) between the end of the P wave and the beginning of the QRS complex. It reflects the conduction of electrical impulses through the atrioventricular (AV) node, allowing for a brief delay before the ventricles contract. The duration of the PR segment is crucial for assessing the heart's electrical conduction system and can indicate various cardiac conditions if prolonged or shortened.