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 103

ECG 103


Basic rhythm

P waves preceded by a spike at 75 bpm.

PR interval

Prolonged at 280 ms.


Normal axis and duration. Q waves from V1 to V4.

T waves


ST segment


QT interval



P wave following a electrical spike.


Pacemaker in AAI mode with pacing in unipolar mode.


The spikes at the beginning of the P waves demonstrate the electrical pacing of the atria. The (DDD) pacemaker is programmed to only pace the ventricles if there is no ventriculogram following the P wave, or if the P wave appears after a long A-V delay. Here the pacemaker is working in AAI mode, since the spontaneous PR interval is not prolonged enough to provoke stimulation of the ventricles. The amplitude of the spikes shows that the stimulation is unipolar.




Reading level

1 / 3