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 052

ECG 052


Basic rhythm

Sinus rhythm, regular at 105/min (for the P waves) and 38/min for the QRS complexes.

P waves

Normal, completely dissociated from the QRS complexes.

PR interval



Axis and duration normal.

ST segment


T waves


QT interval



AV dissociation.
Narrow QRS complex.
Different morphology of the QRS complex.


Complete A-V block with junctional escape rhythm (or high degree block).


The complete dissociation of P waves and QRS complexes (with a higher heart rate for the P waves than the QRS complexes) confirms the diagnosis of complete A-V block. If the QRS complexes remain narrow, it is because the escape occurs in the nodal region. In the present case, the morphology of the second QRS complex is slightly different from the others, probably due to an A-V conduction that occassionally reestablishes itself, in which case it is more accurate to call this a high degree A-V block than a complete block.


Conduction abnormalities


Reading level

2 / 3