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 123

ECG 123


Basic rhythm

Sinus rhythm, regular at 107 bpm.

P waves

Amplitude and duration at the upper limit (110 ms) in the peripheral leads.

PR interval



Normal. Axis undetermined.

ST segment


T waves

Negative in all parts of the trace.

QT interval

Prolonged (400 ms and QTC 520 ms).


Sinus tachycardia.
Modifications of repolarization.


Widespread changes to the repolarisation. Prolonged QT interval.


The changes to the terminal phase (negative T waves), which are widespread and present in practically all the leads, suggest pericarditis. In this case, there is cardiac contusion (which has caused slight effusion) but no typical signs which allow us to make such a diagnosis.


Abnormal repolarization


Reading level

1 / 3