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 201

ECG 201


Baseline rhythm

Regular at 130 bpm.P-waves: negative in II, III and aVF.PR interval: normal (140 ms).QRS: normal. Axis 90º.ST segment: isoelectric.T-waves: normal.QT interval: normal.


P' waves at the ned of the QRS complex.


Nodal tachycardia with  2:1 A-V block.


This is a narrow complex tachycardia with P’ waves visible exactly in the middle of the RR interval. This is what is classically seen in nodal tachycardias with 2:1 A-V block. On careful analysis of the end of the QRS complex in II, III and aVF, we see a little bump which corresponds to a non-conducted P’-wave.


Narrow QRS complex tachycardia


Reading level

3 / 3