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 116

ECG 116


Basic rhythm

Wide complex tachycardia, 150 bpm.

P waves

Visible only in II and III before and after a narrow QRS complex.

PR interval



Wide (130 ms), rsR pattern in V1, wide S wave in V6. Axis -45°. Some narrow QRS complexes in the peripheral leads.

ST segment, T waves

Widespread changes in the terminal phase.

QT interval



Left axis deviation.
Right bundle branch morphology.
Fusion and capture beats.


Ventricular tachycardia arising from a bundle branch.


The presence of narrow, capture and fusion complexes, and the A-V dissociation (visible P waves, particularly in V2, after the capture complex) are reliable criteria for the diagnosis of ventricular tachycardia. The QRS morphology, typical of right bundle branch block with left axis deviation, is characteristic of tachycardia at the starting point of the bundle, which reacts well to calcium antagonists.


Wide QRS complex tachycardia


Reading level

3 / 3