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 009

ECG 009


Basic rhythm

Sinus rhythm, regular at 72 bpm.

P waves


PR interval

Elongated (400ms).


Enlarged (200 ms); left axis deviation. rSR' from V1 to V4.

ST segment, T waves

Non-specific changes in the terminal phase.

QT interval



Prolonged PR interval.
Wide QRS complexes with RBBB morphology.
Prolonged QT interval.


Flecainide intoxication (Class Ic antiarrhythmic agent). First degree A-V block. Complete right bundle branch block (RBBB). Left anterior hemiblock.


Such a significant enlargement of the QRS complex (responsible here for an elongation of the QT interval) can not be explained by the right bundle branch block alone. In such a situation intoxication caused by a class Ic antiarrhythmic agent should always be considered. Quinidine (class Ia), amiodarone and sotalol (class III) elongate the QT interval. In this case, the QT interval is prolonged because the QRS complex is enlarged.


Electrolytes disorder and intoxication


Reading level

3 / 3