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 019

ECG 019


Basic rhythm

Narrow complex tachycardia at 280 bpm.

P waves


PR interval

Not definable.


Horizontal axis, normal morphology.

ST segment

Depression from V2 to V5.

T waves

Flattened or negative in almost all leads.

QT interval

Not definable.


Rapid (280bpm) narrow QRS complexes tachycardia without visible P wave.
ST segment depression.


Typical atrial flutter with 1:1 conduction.


The "F" waves typical of atrial flutter are not visible, concealed by the ventricular complexes that are very close together. An electrophysiological investigation would be required for the diagnosis and to distinguish this flutter from typical atrioventricular nodal tachycardia (of which the rate is not as high) or from orthodromic A-V tachycardia. At this ventricular rate, atrial flutter with 1:1 conduction is the most probable diagnosis, because typical atrioventricular nodal re-entrant tachycardia and orthodromic tachycardia very rarely have such high rates. The ST segment depression is non-specific.


Narrow QRS complex tachycardia


Reading level

3 / 3