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 048

ECG 048


Basic rhythm

Irregular bradycardia with an average rate of < around 34 bpm.

P waves


PR interval

Not definable.


Enlarged by a terminal J wave deforming its terminal portion; normal axis.

ST segment


T waves


QT interval

Prolonged (840 ms).


Absence of P waves. Baseline oscillation typical for atrial fibrillation.
Osborn wave.




The additional J wave (also called an Osborn wave) at the end of the QRS compex is absolutely typical of hypothermia (in this case the body temperature is 29°C). Hypothermia is also responsible for the slow junctional rhythm and the prolonged QT interval.


Various cardiopathy


Reading level

2 / 3