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 220

ECG 220


Baseline rhythm

Regular at 75 bpm.



PR interval

Prolonged at 560 ms.QRS: wide at 130 ms, axis -40°.

ST segment

Depressed in II, aVF, V5 and V6.T-waves: normals.QT interval: normal.

Intervalle PR

Normal.QRS: durée normale, micropotentiels dans les périphériques. Axe 0°. Changement de morphologie dans les précordiales.Segment ST: normal.Ondes T: normales.Intervalle QT: normal.


Modifications of the QRS aspect.


Progressive occurrence of a conduction delay on the left bundle branch.


This trace is normal until the QRS complex widen with an increased amplitude of the S wave in the precordial leads. This is due to conduction slowing on the left bundle branch consecutively to a shortening of the PR interval. The duration of the QRS complex is also slightly increased.


Conduction abnormalities


Reading level

1 / 3