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 014

ECG 014


Basic rhythm

Narrow complex tachycardia, irregularly irregular, between 150 and 190 bpm.

P waves

Not visible.

PR interval

Not definable.


Axis -30°, morphology normal, with the exception of four enlarged QRS complexes, right bundle branch block type.

ST segment

Depression from V4 to V6.

T waves

Variable morphology, no systematic pattern.

QT interval



Wide QRS complexes type Rigth Bundle Branch Block (RBBB).
Wide QRS complexes type Rigth Bundle Branch Block (RBBB).
Narrow QRS complexes tachycardia irregularly irregular.


Atrial fibrillation with rapid ventricular response and Ashman phenomenon.


The classical trace of atrial fibrillation is scattered with enlarged QRS complexes due to the Ashman phenomenon and must not be confused with ventricular extrasystoles. Ashman phenomenon is a functional conduction disturbance, generally in the form of a right bundle branch block which occurs in atrial fibrillation at the end of a short diastole that is itself preceded by a long diastole. In rapid atrial fibrillation, ST segment depression is common but it does not have clinical significance.


Narrow QRS complex tachycardia


Reading level

1 / 3