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 022

ECG 022


Basic rhythm

Irregular wide complex tachycardia: mean rate 150 bpm.

P waves


PR interval

Not definable.


Enlarged (400 ms); extreme left axis deviation; S wave largely predominant in the precordial leads (QS pattern from V3 to V5).

ST segment, T waves

Diffuse and non-specific changes in the terminal phase.

QT interval

Not definable.


Left axis deviation.
Wide QRS complexes tachycardia.
Tachycardia irregularly irregular.


Atrial fibrillation under antiarrhythmic treatment (class Ic : flecainide).


The rS and QS pattern in all the precordial leads could be interpreted as a "negative concordance" suggestive of ventricular tachycardia. It is in fact a pseudo negative concordance. A small r wave in V1 is suggestive of a supraventricular origin of the arrhythmia, or, more precisely, an atrial fibrillation due to the relatively marked irregularity of the tachycardia. The very significant enlargement of the QRS complex is noteworthy, as this is always suggestive of drug intoxication.


Wide QRS complex tachycardia


Reading level

3 / 3