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 050

ECG 050


Basic rhythm

Narrow complex tachycardia, regular at 136 bpm.

P waves

Negative in II, III, aVF, detached from the QRS complex.

PR interval

RP' < P'R.


Axis, duration and morphology normal.

ST segment


T waves


QT interval



Negatives P' waves in II,III and aVF. RP' < P'R.
Narrow QRS complexes tachycardia.


Orthodromic tachycardia with an infero (postero)-septal accessory pathway.


The RP’ < P’R interval identifies an orthodromic tachycardia, with an accessory pathway that a P wave, negative only in the inferior leads, indicates as being infero(postero)-septal.


Narrow QRS complex tachycardia


Reading level

2 / 3