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 016

ECG 016


Basic rhythm

Irregularly irregular with narrow complexes; rate between 70 and 100 bpm, (mean 84 bpm).

P waves

Absent, replaced by "f" waves of variable amplitude, duration and morphology, which are clearly visible in V1 and have a rate (which is also variable) of approximately 400/min.

PR interval



Axis at -10° normal morphology.

ST segment


T waves

Diffusely flattened.

QT interval

Not measurable.


Controled ventricular rate.
Absence of P waves. Oscillation of the baseline. Rythm irregularly irregular.


Atrial fibrillation with controlled ventricular rhythm.


Atrial fibrillation is the most common type of arrhythmia, and it is even more common in elderly patients. If left untreated, the ventricular response is usually fast, (although "slow" atrial fibrillation does exist) and requires medication to slow the conduction in the A-V node. Due to its irregularity, the ventricular rate must be calculated over 6 to 8 beats.


Narrow QRS complex tachycardia


Reading level

1 / 3