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 203

ECG 203


Baseline rhythm

Irregularly irregular.P-waves: not visibles.PR interval: not mesurable.QRS: prolonged. Axis -10°.ST segment: depressed from V4 to V6.T-waves: normal.QT interval: normal.


Rhythm irregularly irregular.
Wide QRS typical for left bundle branch block.


Atrial fibrillation and LBBB.


The complete irregularity of the QRS (irregularly irregular) enabled the diagnosis of atrial fibrillation. The QRS duration of more than 120 ms and its morphology is characteristic of LBBB. The presence of small Q-waves in V5 and V6 could be suggestive of an old anterior infarct.


Conduction abnormalities


Reading level

1 / 3