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 077

ECG 077


Basic rhythm

Sinus rhythm at 86 bpm.

P waves


PR interval

Prolonged at 220 ms.


Normal duration and axis. Q waves from V1 to V3.

ST segment

Elevation from V2 to V5, also present I and aVL due to anterior ischaemia. Mirror image depression in III and aVF. No changes to the ST segment in V5-V6.

QT interval



ST segment elevation.
ST segment elevation.


STEMI (ST elevation myocardial infarction) due to LAD occlusion. First degree A-V block.


The ST segment elevation (with mirror image depression) is a sign of an ischaemic lesion, due to a coronary occlusion located between the first septal and the first diagonal. This location can lead us to expect extensive necrosis requiring emergency revascularisation.


Ischemia and myocardial infarction


Reading level

1 / 3