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 092

ECG 092


Basic rhythm

Regular, paced at 60 bpm.

P waves

Preceded by spikes.

PQ interval

Separating the atrial and ventricular spikes.


Paced, but with 2 morphologies in the precordial leads (from the second QRS complex onwards).

ST segment


QT interval



Rigth ventricular spike.
2 types of QRS complexes.
Left ventricular spike.


Paced rhythm with a cardiac resynchronisation pacemaker. Dysfunction of the left ventricle pacing lead.


The atrial spikes confirm that the atria are paced by the pacemaker. The 2 morphologies of the QRS complexes are due to the left ventricular (LV) pacing being stopped abruptly (from second QRS complex onwards in the precordial leads). Therefore, only classic bichamber pacing persists (RA and RV). The interruption of the left ventricular pacing is due to a dysfunction of the coronary sinus pacing lead which stimulates the LV.




Reading level

3 / 3