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 110

ECG 110


Continuous recording. Basic rhythm

Sinus rhythm at 75 bpm.

PR interval

Normal at the start. P waves not followed by QRS complexes on the bottom trace.


Normal duration.

T waves


ST segment


QT interval



Non conducted P waves.


High-degree A-V block.


The first part of this Holter recording shows a completely normal trace. A 2:1 second degree A-V block suddenly appears, followed by a high-degree A-V block which led to a syncope. Recordings of this type are relatively rare for patients with syncopes since this type of block can be very paroxystic. Clearly a pacemaker must be implanted immediately.


Conduction abnormalities


Reading level

2 / 3