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 154

ECG 154


Baseline rhythm

Regular broad complex tachycardia at 137 bpm.P-waves: P’-waves visible in V1 halfway between 2 QRS complexes.PR interval: prolonged (220 ms).QRS: broadened (160 ms). Deep S-wave in all of the precordial leads, left axis deviation (-100º). Normal amplitude. Presence of a spike at the beginning of the QRS complex.ST segment: elevation from V2 to V4 and in II, III and aVF.QT interval: normal.


Wide QRS complex tachycardia.
Spikes at the beginning of the QRS complex.
P' waves preceding each QRS complex.


Atrial tachycardia with 1:1 conduction to the ventricle.


This is a broad complex tachycardia. If we apply the criteria of differentiation of broad complex tachycardias, we could conclude that this is a ventricular tachycardia. The presence of the spike at the beginning of the QRS complex allows us to conclude that this is indeed a supraventricular tachycardia with 1:1 conduction to the ventricle. The RP’ interval> P’R interval (P’-waves visible in V1) permits the right diagnosis of atrial tachycardia to be made.


Wide QRS complex tachycardia


Reading level

3 / 3