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 028

ECG 028


Basic rhythm

Sinus rhythm, regular at 75 bpm.

P waves


PR interval



Normal duration (110 ms), axis -60°, QS pattern from V1 to V3, rS (low amplitude wave) from V4 to V6.

ST segment

Elevated from V1 to V4.

T waves

Negatives in I, aVL and from V4 to V6.

QT interval



ST segment elevation.
Left axis deviation.
Q waves.


Old anterior myocardial infarction with ventricular aneurysm. Left anterior hemiblock.


The QS waves in the first three precordial leads and the ST segment elevation are characteristic of a subacute phase of antero-septal infarction. After a period of more than three months after the coronary event, the persistance of the ST segment elevation means that dyskinesia or aneurysm of the ventricular wall can be diagnosed. The left axis deviation is the result of the left anterior hemiblock.


Ischemia and myocardial infarction


Reading level

1 / 3