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 058

ECG 058


Basic rhythm

Regular sinus rhythm (65 bpm).

P waves


PR interval



Normal axis, duration and morphology.

ST segment


T waves

Negative in III and aVF.

QT interval

Decreased (320 ms, for a normal value, corrected on the basis of the heart rate, of 330 ms).


Short QT interval.


Short QT syndrome.


An abnormal shortening of the QT interval is considered to be pathological when its duration is shorter than its theoretical duration by 10%. Short QT syndrome can be congenital or acquired due to hypercalcaemia or digitalis intoxication. This patient had hypercalcaemia at 3.9 mmol/l due to primary hyperparathyroidism.


Various cardiopathy


Reading level

3 / 3