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 011

ECG 011


Basic rhythm

Sinus tachycardia at 120 bpm.

P waves


PR interval



Enlarged (130 ms) rSRí pattern in V1, deep S wave in II, III, aVF, V5 and V6; left axis deviation at -40°.

ST segment


T waves


QT interval



Left axis deviation.
rSR' typical for Rigth Bundle Branch BLock (RBBB).


Sinus tachycardia wtih bifascicular block (right bundle branch block and left anterior hemiblock = LAH).


The right bundle branch block does not change the electrical axis because the first 0.06 ms depend on the left bundle branch, which allows the axis to be determined. The left axis deviation is associated with a concomitant left anterior hemiblock. The combination of these 2 conduction disturbances is relatively frequent compared to the other form of bifascicular block which combines a right bundle branch block with a left posterior hemiblock. The latter is rare and often suggests the occurrence of a complete A-V block.


Wide QRS complex tachycardia


Reading level

1 / 3