EKG Overview

This mobile edition of our website includes our EKG reference guide. We also have expanded text on popular EKG topics. EKG drills and quizzes are available on our desktop/tablet website.

EKG Training

EKG Training
(PCs and Tablets)

Desktop Edition

What is an EKG?

An EKG captures the heart's electrical activity. It reveals the heart's rate and rhythm as well as the details regarding the condition of the heart. EKGs are used to diagnose heart arrhythmias, heart attacks, pacemakers performance and heart failure.

With each heartbeat, an electrical signal moves from the top of the heart to the bottom. As it travels, the signal causes the heart to contract and pump blood. The process repeats with each new heartbeat. An EKG machine records these electrical signals across multiple heart beats and produces an EKG strip that is interpreted by a healthcare professional.

How EKG Works

A normal EKG tracing consists of waveform components which indicate electrical events during one heart beat. These waveforms are labeled P, Q, R, S, T and U.

P wave is the first short upward movement of the tracing. It indicates that the atria are contracting, pumping blood into the ventricles.

The QRS complex, normally begins with a downward deflection, Q; a larger upwards deflection, a peak (R); and then a downwards S wave. The QRS complex represents ventricular depolarization and contraction.

The PR interval indicates the transit time for the electrical signal to travel from the sinus node to the ventricles.

T wave is normally a modest upwards waveform representing ventricular repolarization.

EKG with P Wave, PR Interval, QRS complex and T wave


EKG Interpretation Tutor

Use our online EKG 'Workbook' to practice your EKG analysis skills and to learn over 40 different types of EKG tracings. After your analysis is completed, our EKG tutor presents an analysis from an EKG expert.

EKG Interpretation Tutor

Arrhythmia Drills

Using multiple choice questions and answers, users are asked to identify arrhythmia tracings. Digital calipers are available to assist in analyzing each practice strip. Feedback is provided after each response.

Arrhythmia Practice Drills


Our training guide provides information about many types of arrhythmias. For each arrhythmia we provide multiple electrocardiogram tracings. Analysis is provided using a concise summary of the electrocardiogram's key features. Tracing features can be measured using our digital calipers.

EKG Guide

12 Lead EKG

New to our website, a presentation on 12 lead EKG prepared by Dr. Michael Mazzini, M.D., Boston University Medical Center.

12 Lead Training

Training - Introduction

The focus of this introductory course is to provide a tutorial about the main features of electrocardiograms along with an analysis method. This method includes assessment of rhythm, calculating heart rate, observing P-wave forms, measurement of EKG intervals and segments and the evaluation of other relevant waves. Practice exercises serve to reinforce the lesson content.

EKG Training

Abnormality Directory and Links

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