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 097

ECG 097


Basic rhythm

Sinus rhythm at 78 bpm.

P waves


PQ interval



Wide at 140 ms for all complexes in the peripheral leads, and the first 2 complexes in the precordial leads. rSR' pattern. Atrial extrasystole followed by a narrow QRS complex (3rd complex in the precordial leads).

QT interval



Right bundle branch block (RBBB).


Right bundle branch block (RBBB), heart rate dependant on branch to branch re-entry. Following this, there is a normal sinus rhythm with narrow QRS complexes.


This image is typical of a heart rate dependant right bundle branch block, known as phase 3, on a branch to branch re-entry. The atrial extrasystole allows antegrade depolarisation of the right branch which can then return to normal conduction.


Conduction abnormalities


Reading level

2 / 3