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 132

ECG 132


Basic rhythm

Sinus rhythm at 80 bpm.

PR interval

At the lower normal limit.


Normal duration with rSR' pattern in V1.

QT interval



Short PR interval.
Incomplete Rigth Bundle Branch Block (BBB).


Incomplete right bundle branch block. Short PR interval.


The right bundle branch block is incomplete if the morphology of the QRS complex in V1 is that of a right bundle branch block, but without its duration being greater than 120 ms. The short PQ interval relates either to an accelerated A-V conduction or to a condition called Lown-Ganong-Levine syndrome which is a bypass of the A-V node through an A-V accessory pathway. Pre-excitation may also form part of the differential diagnosis, if the accessory pathway is on the left side, far from the A-V conduction pathways. In such cases the pre-excitation is not easily seen on the ECG.


Conduction abnormalities


Reading level

1 / 3