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 171

ECG 171


Basic rhythm

Regular tachycardia at 173 bpm.

P waves

Not visible.

PR interval

Not applicable.


Wide (140 ms). Axis -10°.

ST segment

Depressed in III and aVF.

T waves

Negative in III and aVF

QT interval



Wide QRS complex tachycardia with A-V dissociation.
A-V dissociation.


Ventricular tachycardia (fascicular type).


On looking at the trace carefully, we notice an A-V dissociation in leads II and V1. This is a very strong argument in favour of ventricular tachycardia. The QRS is not very broad. We notice a deep S-wave in V5 and V6 with a LBBB-morphology QRS complex. These all point to a fascicular origin of the ventricular tachycardia. Usually, you get RBBB morphology following an infarct which causes conduction abnormalities in the left bundle.




Reading level

3 / 3