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 089

ECG 089


Basic rhythm

Sinus rhythm at 67 bpm.

P waves


PQ interval

Prolonged at 280 ms.


Axis -45 degrees, normal duration.

ST segment


T waves

Negatives from V3 to V6, in I and aVL.

QT interval

Prolonged at 560 ms.


Left axis deviation.
Prolonged QT interval.
Prolonged AV interval.


Acquired long QT syndrome due to anterolateral ischaemia. First degree A-V block. Left anterior hemiblock.


This is a significant prolongation of the QT interval relating to extensive anterolateral ischaemia (acute coronary syndrome). The QT interval usually returns to normal following treatment of the ischaemia. Although the cause of the QT interval prolongation is known in this case, the other causes must also be reviewed, as it could add to the ischaemia.


Narrow QRS complex tachycardia


Reading level

1 / 3