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 005

ECG 005


Basic rhythm

Wide complex tachycardia, regular at 136 bpm.

P waves

No relation to QRS complexes (complete A-V dissociation) at 45 bpm.

PR interval



Enlarged (160 ms) left axis deviation, QS pattern over all precordial leads (negative concordance).

ST segment, T waves

Diffuse changes in the terminal phase.

QT interval



AV dissociation (dissociation between atrial and ventricular activity).
Negative concordance in the precordium.
Wide QRS complexes tachycardia.


Ventricular tachycardia.


Complete A-V dissociation is an absolute criterion for the diagnosis of ventricular tachycardia. The negative concordance is an excellent sign of this and indicates that the vector is directed in an anterioposterior direction, avoiding the precordial leads and originating from the left ventricular apex.


Wide QRS complex tachycardia


Reading level

1 / 3