EKG Basics and Interpretation

PR interval: time interval from onset of atrial depolarization to onset of ventricular depolarization • QT interval: duration of ventricular depolarization and repolarization • RR interval: duration of ventricular cardiac cycle • PP interval: duration of atrial cycle. As a positive wave of depolarization within the heart moves toward a positive electrode there is a upward deflection recored on EKG