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 039

ECG 039


Basic rhythm

Sinus rhythm at 31 bpm.

P waves

Normal in alternation with negative P waves in II, III and aVF adjacent to the T waves.

PR interval

190 ms.


Narrow, axis -20.

T waves


QT interval



Negatives P waves in II, III and aVF.


His-bundle extrasystoles.


In the presence of P waves in bigeminy the following diagnoses must be considered: atrial bigeminy, retrograde conduction by a septal accessory pathway with slow conduction or His-bundle extrasystoles. The latter was diagnosed with a Holter recording and confirmed by electrophysiological investigation. In the present case, the His-bundle extrasystole is conducted retrogradely to the atria but is not conducted to the ventricles.




Reading level

3 / 3