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 085

ECG 085


Basic rhythm

Sinus rhythm at 100 bpm. QRS at 38 bpm.

P waves

Normal but dissociated from the QRS complexes.

PR interval



Left axis, rsR' pattern in V1.

QT interval

Prolonged at 600 ms.


A-V dissociation.
Prolonged QT interval.
rSR' aspect.


Complete A-V block. Escape rhythm with image of right bundle branch block and left anterior hemiblock. Long QT interval.


The A-V dissociation is a sign of a complete A-V block. The escape rhythm with its bifascicular block morphology (complete right bundle branch block and left anterior hemiblock) originates from the posterior hemibranch or the bundle of His with a bifascicular block on the right branch and anterior hemibranch. The QT interval prolongation is not related to the conduction disturbances but certainly has another cause, for example drug treatment, an electrolytic disorder, ischaemia, etc.


Conduction abnormalities


Reading level

3 / 3