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 094

ECG 094


Basic rhythm

Sinus rhythm at 66 bpm.

P waves

Normal. Presence of ectopic P waves with normal axis.

PR interval



Horizontal axis, prolonged duration at 160 ms.

ST segment

Elevation in II, V5 and V6.

QT interval



Premature contraction.
Prolonged QRS complex duration.


Bigeminal right atrial extrasystoles, complete left bundle branch block.


The ectopic P waves are atrial extrasystoles arising in the right atrium, since their axis is very close to the sinus P waves. The morphology of the QRS complex is typical of a left bundle branch block and the changes in the ST segment are due to the conduction disturbance.




Reading level

1 / 3