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 150

ECG 150


Basic rhythm

Sinus rhythm at 54 bpm.

P waves


PR interval



Normal duration, right axis +110 degrees.

T waves

Negative from V1 to V4. QT interval: normal.


Rigth axis deviation.
Negatives T waves from V1 to V4 related to rigth ventricular overload.


Right axis deviation due to pulmonary stenosis.


This trace shows the slight changes which can be observed in this type of clinical situation, since there is deviation of the QRS complex on one axis only, and negative T waves from V1 to V4 which correspond to right ventricular strain.


Various cardiopathy


Reading level

2 / 3