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 177

ECG 177


Continuous recording of a single lead.P-waves visible and variable in terms of duration and shape.Intermittent absence of P-waves and then appearance of baseline oscillation.Presence of sinus pauses after cessation of the atrial fibrillation.P-waves not always followed by a QRS complex.QRS complexes sometimes normal, sometimes prolonged.


Atrial fibrillation.
Wide QRS complex.
2° 2:1 A-V block.
Pause following the end of atrial fibrillation.


Alternation of 2:1 second-degree A-V block with focal atrial fibrillation. Intermittent bundle branch block.


The ‘P on T’ waves which initiate atrial fibrillation are typical of focal atrial fibrillation. The broadening of the QRS complex indicates intermittent conduction disturbance. We also note intermittent RBBB. The pauses after the cessations of the episodes of atrial fibrillation are common. On the other hand, the A-V conduction disturbances are not part of the context of focal atrial fibrillation and indicate a separate conduction problem at the level of the A-V node and in particular Mobitz type II in view of the intermittent bundle branch block.




Reading level

2 / 3