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 036

ECG 036


Basic rhythm

Sinus rhythm, regular at 67 bpm.

P waves

Normal. Run of ectopic P waves at a rate of 250 bpm. Irregularly irregular arrhythmia.

PQ interval

Prolonged at 280 ms.



QT interval



Atrial fibrillation.
Sinus rhythm.


Regular sinus rhythm with runs of atrial arrhythmia. (focal atrial fibrillation).


The arrhythmia (atrial extrasystoles) provokes atrial fibrillation. The extrasystole initiating the run is in the T wave. After a pause, which allows time for the conduction pathways to recover, the PR interval is normal. The recording starts with a rhythm of atrial fibrillation (2 leads at the top).


Narrow QRS complex tachycardia


Reading level

1 / 3