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 045

ECG 045


Basic rhythm

Narrow complex tachycardia, regular at 160 bpm.

P waves

Negative in II, III, aVF, V5 and V6, detached from the QRS complex.

PR interval

RP' > P'R.


Horizontal axis; duration and morphology normal.

ST segment


T waves


QT interval



Interval RP' > P'R.
Narrow QRS complexes tachycardia.
Negatives P' waves in V4 to V6.


Permanent junctional reciprocating tachycardia (Coumel's tachycardia or PJRT).


Inverted atrial activation (in a caudo-cranial direction) suggests either low right atrial tachycardia, atypical nodal re-entrant tachycardia or permanent junctional reciprocating tachycardia, also known as Coumel's tachycardia.

Slow retrograde conduction, identified by a RP' > P'R interval, is characteristic of an accessory pathway that is the anatomical substrate of permanent junctional reciprocating tachycardia. The age of the patient and the permanent form of the tachycardia are also important factors in the diagnosis.


Narrow QRS complex tachycardia


Reading level

2 / 3