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 105

ECG 105


Basic rhythm

Irregularly irregular, variable heart rate (around 150 bpm).

P waves

Not visible.

PR interval



Normal morphology, duration and axis.

ST segment

Depression in I, II, aVF and from V2 to V6.

T waves

Widespread changes in the repolarisation.

QT interval



Irregularly irregular narrow QRS complexes.


Atrial fibrillation with rapid ventricular response.


The changes in the terminal phase are non-specific and relate to tachycardia, or to ischaemia indicated by a relatively high heart rate.


Narrow QRS complex tachycardia


Reading level

1 / 3