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 120

ECG 120


Basic rhythm

Sinus rhythm, regular at 75 bpm.

P waves


PR interval

Enlarged (400 ms).


Normal morphology, duration and axis.

ST segment


T waves


QT interval



Prolonged PR interval.


First degree A-V block.


This first degree A-V block (which is distinctive due to the very significant prolongation of the PR interval), suggests an infranodal conduction disturbance. In the absence of related symptoms or cardiopathy, no treatment or specific investigation is suggested in this case.


Conduction abnormalities


Reading level

2 / 3