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 189

ECG 189


Baseline rhythm

Regular at 100 bpm.P-waves: non-visible.PR interval: non-measurable.QRS: broadened (110 ms); 2 morphologies. Variable axis from -30º or -45º. Spikes visible in III.ST segment: depressed in the precordial leads.T-waves: negative in II, III and aVF and from V2 to V6.QT interval: normal.


Paced rhythm.
Atrial fibrillation.


Atrial fibrillation and intermittent pacing.


We don’t see P-waves and there is oscillation of the baseline. This corresponds to atrial fibrillation as the baseline rhythm. The QRS complexes have variable morphology with a sudden change of axis (3rd complex from the left). We see a small spike at the beginning of the 4th complex which corresponds to pacing that begins at that point. The morphology of the first two QRS complexes on the left is that which one sees in the context of a cardiomyopathy.




Reading level

2 / 3