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 130

ECG 130


Basic rhythm

Wide QRS complex tachycardia, alternating with rare narrow QRS complexes, preceded by a P wave (5th and 11th complexes).

PR interval



When the QRS complex is narrow, its duration, amplitude and axis are normal. Irregular wide QRS complex tachycardia, positive concordance in the precordial leads.

ST segment

Depression in leads I, II and aVL when the QRS complexes are narrow.

QT interval



Normal QRS complex.
Wide QRS complex tachycardia.


Runs of ventricular tachycardia.


The positive concordance (predominant R waves in all precordial leads) suggests either antidromic tachycardia in an accessory bundle, or ventricular tachycardia. The tachycardia is slightly irregular and the QRS complexes do not show a delta wave. Between the runs of tachycardia, the sinus rhythm narrow QRS complexes show Q waves in leads III and aVF which suggest a previous inferior infarction.


Wide QRS complex tachycardia


Reading level

3 / 3