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 117

ECG 117


Basic rhythm

Sinus, regular, 98 bpm

P waves


PR interval

Increased, of variable duration (240 to 360 ms); after the interval has been prolonged, some P waves are not conducted.


Amplitude increased in the precordial leads (SV1 + R V5 = 48 mm); poor progression of R wave in precordial leads; duration, morphology normal

ST segment, T wave

Alterations in terminal phase in peripheral leads and the last precordial leads

QT interval



Blocked P wave.
Increased QRS complex amplitude.
Prolongation of the PR interval.


Permanent first degree A-V block, intermittent Wenckebach-type second degree A-V block. Left ventricular hypertrophy.


This alternance of two types of second degree A-V blocks is typical of a conduction disorder in the A-V node. Repolarisation problems are the result of left ventricular hypertrophy.


Conduction abnormalities


Reading level

1 / 3