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 156

ECG 156


Baseline rhythm

Irregular at 100 bpm.P-waves: visible with a normal axis.PR interval: prolonged at 240 ms.QRS: broadened (160 ms). Axis at +100°.ST segment : depressed in I, II and aVF.T-waves: normal.QT interval: normal.


Left bundle branch block morphology with duration of the QRS complex > 120 ms.
Prolonged PR interval.
Right axis deviation.
Atrial extrasystoles.


Sinus tachycardia with atrial extrasystoles. Right axis deviation.


We can clearly see p-waves with a normal axis. There are clearly some atrial extrasystoles with a PR interval longer than in sinus rhythm. The morphology of the QRS complex is typically that of left bundle branch block. Furthermore, the QRS axis is deviated to the right in a patient with a cardiomyopathy.


Conduction abnormalities


Reading level

1 / 3