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 027

ECG 027


Basic rhythm

Wide complex tachycardia, regular at 120 bpm.

P waves

Not visible.

PR interval

Not definable.


Enlarged (160 ms), rSR' pattern in the right precordial leads.

ST segment


T waves


QT interval



Narrow QRS complexes tachycardia without visible P wave.
rSR' aspect typical for Rigth Bundle Branch Block (RBBB).


Typical atrioventricular nodal tachycardia. Right bundle branch block.


The absence of P waves (concealed in the QRS complex) allows this type of tachycardia to be identified, which, in this example, has a slower rate than atrioventricular nodal tachycardias normally have. At this rate, the bundle branch block is probably not functional but it more likely existed prior to the tachycardia.


Wide QRS complex tachycardia


Reading level

2 / 3