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 147

ECG 147


Baseline rhythm

Tachycardia with broad QRS waves and groups at 150 bpm.

Ondes P

Not visible.

PR interval



Extended length at 140 ms. Normal axiss.

Segment ST

Not assessable.

T waves

Negatives in almost all leads.

QT interval



Left bundle branch block aspect.
Narrow QRS complex.
Wide QRS complex tachycardia at 150 bpm.


Atrial flutter with 2:1 conduction and with an aberration in conduction (left bundle-branch block).


Atrial flutter must always be suspected when a tachycardia rate is 150 bpm. If the diagnostic criteria applicable to tachycardia with broad QRS waves and groups are used, one realises that there is an aberration in conduction here (typical left bundle-branch block). This conduction problem is not always fully present as is evident in the second group in V1, V2 and V3.


Wide QRS complex tachycardia


Reading level

3 / 3