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 072

ECG 072


Basic rhythm

Sinus rhythm at 75 bpm.

P waves


PR interval



Micropotentiels in the peripheral leads. Q waves from V1 to V5, QR pattern from V1 to V3. Widened at 140 ms.

ST segment

Elevation from V3 to V5, slight elevation in I and V6.

T waves

Flattened in the peripheral leads, negative in all precordial leads.

QT interval



Q wave.
ST segment elevation.


Complete right bundle branch block, previous anteroseptal-apical infarction with probable anterior wall aneurysm. Micropotentiels.


In V1, the initial r wave has been replaced by a Q wave due to necrosis (present in all precordial leads) which disturbs the classic image of a right bundle branch block. The diagnosis of the block therefore rests on the widening of the QRS complex and the thickened S wave in I. Outside the acute phase of an infarction, ST segment elevation is typical of wall dyskinesia or an aneurysm.


Conduction abnormalities


Reading level

2 / 3