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 064

ECG 064


Basic rhythm

Regular at 66 bpm.

P waves

Invisible in the peripheral leads, replaced by a baseline wave pattern; rate around 300 bpm. In V6, P waves are clearly visible.

PR interval



Normal axis, duration and morphology.

ST segment


T waves


QT interval



Baseline oscillations.
P wave.


Electrical artefact due to a heart tremor in a patient with Parkinson's disease.


Electrical activity is difficult to define on the baseline. However, in the precordial leads, small-scale regular electrical activity before the QRS complexes is visible (in the form of sinusoidal P waves). The rhythm is sinusoidal throughout the ECG printout, with interference on the baseline caused by the electrical artefact. This shows the need for high-quality recordings in order to correctly interpret ECG traces.


Various cardiopathy


Reading level

1 / 3