Which part of the EKG measures the interval between atrial and ventricular conduction?

The PR interval is the segment of the EKG that measures the time it takes for electrical impulses to travel from the atria to the ventricles. It begins at the start of the P wave, which represents atrial depolarization, and extends to the start of the QRS complex, which signifies the beginning of ventricular depolarization. This interval reflects the conduction time through the atrioventricular (AV) node, where there is a slight delay allowing for the ventricles to fill with blood after the atria contract. A normal PR interval typically ranges from 120 to 200 milliseconds, and any prolongation or shortening can indicate underlying conduction abnormalities.

In contrast, the QT interval measures the time it takes for the ventricles to depolarize and repolarize, the ST segment represents the period between ventricle depolarization and repolarization, and the RR interval is the time between successive R waves, which indicates the heart rate but does not provide information on atrial and ventricular conduction.