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 057

ECG 057


Basic rhythm

Sinus tachycardia at 100 bpm.

P waves


PR interval



Normal axis; QRS notched in V1, prolonged S wave in I. At the end of the trace, tachycardia with wide polymorphous complexes (about 340 bpm).

ST segment

Depression in the precordial leads.

T waves

Negative in the same leads.

QT interval



Initation of a right irregular wide QRS complexes tachycardia.


Polymorphic ventricular tachycardia degenerating to a ventricular flutter, with extensive myocardial ischaemia.


The oblique and downward depression in the ST segment in the precordial leads, which appeared on the ECG when the patient made an effort, is a sign of extensive myocardial ischaemia. A first ventricular premature contraction occurs during the third sinus complex, and this distorts the QRS complex (fusion). A second ventricular premature contraction (complex 13) occurs at the end of the T wave (R / T phenomenon) in the vulnerable phase of ventricular repolarisation. This phase is accentuated by the underlying ischaemia, and the premature contraction induces polymorphic ventricular tachycardia which very quickly degenerates into a ventricular flutter, followed by ventricular fibrillation with cardio-circulatory arrest.


Wide QRS complex tachycardia


Reading level

1 / 3