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 071

ECG 071


Basic rhythm

Sinus rhythm at 75 bpm.

P waves


PR interval

Short (between 80 and 140 ms, with different intervals in different leads).


Axis and duration normal. Small slurred upstroke of the initial part of the QRS complex.

ST segment


T waves. normal.

QT interval



Short PR interval.
∂ wave.


Wolff-Parkinson-White type pre-excitation syndrome.


QRS complex seems narrow but a careful examination of its initial part shows a slurred upstroke corresponding to a delta wave with a short PQ interval. This indicates Wolff-Parkinson-White syndrome with the pre-excitation being difficult to identify. Note that the duration of the QRS complex is within normal limits.




Reading level

1 / 3