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 111

ECG 111


Basic rhythm

Sinus rhythm, regular at 65 bpm.

P waves


PR interval

Normal (130 ms).


Prolonged (140 ms); R wave in V1 only, widened S wave, notched in I and thickened in V6. Axis: +110°.

ST segment


T waves

Negative or flattened in the right precordial leads.

QT interval



Deep S wave.
rSR' aspect.


Complete right bundle branch block (RBBB).


The small notch in the ascending part of the QRS complex in V1 corresponds to the start of an Rr pattern outline. In association with a very wide and deformed S wave in I, thickened in V6 (and a small Q wave in II and III), this notch allows us to give the diagnosis of complete right bundle branch block.


Conduction abnormalities


Reading level

1 / 3