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 125

ECG 125


Basic rhythm

Sinus rhythm at 75 bpm.

P waves



Prolonged at 130 ms. Right bundle branch block showing in V1. Axis +60°.

T waves

Negative in V1.

QT interval



rSR' aspect type RBBB.


Right bundle branch block (RBBB).


The right bundle branch block is evident in this young patient suffering from an ostium secundum atrial septal defect. This diagnosis should always be considered when a disturbance of this type is found in a child or young adult. The vertical axis relates to right ventricular strain.


Conduction abnormalities


Reading level

1 / 3