ECG Directory

Welcome to this interactive ECG course.

Although it is one of the oldest paraclinic exams, dating back to the late 19th century, the ECG is still of crucial clinical use. This examination often still poses problems of interpretation to the medical practitioner.

This course aims to help the student, the practicing physician and even the trained cardiologist to improve his knowledge in electrocardiography. It consists of 250 traces of varying complexity with a description of each one by experts. This allows the reader to compare his analysis with that of the experts. In addition, the areas of interest of the ECG can be activated to be clearly highlighted.

We hope that these plots will be useful to readers and will improve their knowledge.

The ECGs are available sorted by keywords and categories.

ECG 055

ECG 055


Basic rhythm

Sinus bradycardia, regular at 50 bpm.

P waves


PR interval



Axis at -30°; rsR pattern in V1, prolonged S wave in V1.

ST segment


T wave

Negative in most leads.

QT interval

Prolonged (500 ms, QTc 460 ms).


Left axis deviation.
ST segment modifications.
rSR' aspect typical for RBBB.


Right ventricular dysplasia; right bundle branch block.


It is the negative T waves in all precordial leads, associated with a right bundle branch block, which allow us to differentiate between right ventricular dysplasia and a bifascicular block (right bundle branch block + left axis deviation) with anterior ischaemia.

The trace was recorded in a patient being treated with Sotalol (a class III antiarrhythmic drug), which explains the QT interval prolongation.


Various cardiopathy


Reading level

1 / 3