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 074

ECG 074


Basic rhythm

Sinus rhythm at 88 bpm.

P waves


PR interval



Enlarged (160 ms); rsr pattern in V1; deep S waves in I, II, III, aVF and in all precordial leads, fusion between the end of the QRS complex and the ST segment.

ST segment

Diffuse non-specific changes to the T wave in the terminal phase.

QT interval

Prolonged (520 ms).


Significant prolongation of QRS complexes duration.


Propafenone intoxication.


The S waves are deep in the left leads. Other significant repolarisation disturbances are not typical of a right bundle branch block. These changes suggest intoxication with class IC antiarrhythmics, which slows conduction in the Purkinje fibres with a marked prolongation of the QRS complex and the QT interval.


Electrolytes disorder and intoxication


Reading level

2 / 3