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 078

ECG 078


Basic rhythm

Irregular bradycardia (40 bpm).

P waves

Only 2 P waves visible (second and fifth beats).

PR interval

Prolonged at 400 ms.


Normal morphology and duration.

ST segment


T waves

Negative in the left precordial leads.

QT interval

Prolonged (600 ms).


Prolonged QT interval.
P wave.
Absence of P wave.


Acquired long QT syndrome, intermittent junctional rhythm. Lithium intoxication.


The QT interval prolongation (in this case induced by lithium intoxication) is associated with sinus arrest with the appearance of a nodal rhythm and an intermittent atrial escape rhythm. The classic electrolyte disorders (Na, K, Ca) are other causes of major changes to repolarisation.


Prolongation of the QT interval


Reading level

3 / 3