EKG Waveform | Lessons | QRS QT PR Components
This page introduces the various components of an EKG waveform.
Letters are used to indicate important points on a typical waveform.
The PR Interval indicates atrioventricular conduction time.
The interval is measured from where the P wave begins until the beginning of the QRS complex.
The QRS complex indicates ventricular depolarization.
The QRS interval is measured from the end of the PR interval to the end of the S wave.
The QT interval indicates ventricular activity, both depolarization and repolarization.
Measure the QT interval from the beginning of the QRS complex to the end of the T wave.
The ST segment traces the early part of ventricular repolarization.
The ST segment begins at the end of the QRS complex and continues to beginning of the T wave.
How To Read An EKG - Lectures
Use EKG.Academy's library of free presentations on cardiac rhythms.
These training materials present the fundamentals for each major category of cardiac rhythms.
The fundamentals are reinforced with practice exercises throughout each lecture.