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 122

ECG 122


Basic rhythm

Sinus rhythm, regular at 85 bpm.

P waves

Prolonged. Terminal portion too large in V1.

PR interval

Prolonged (240 ms).


Prolonged (180 ms). Deep S waves in the right precordial leads, absence of Q waves in the left precordial leads. Left axis deviation (-50°).

ST segment, T waves

Widespread changes to the repolarisation.

QT interval



Sligthly prolonged PR interval.
Increased amplitude of the terminal portion of the P wave.
Wide QRS complex.


First degree A-V block. Complete left bundle branch block (LBBB). Left atrial hypertrophy.


This type of trace is almost always associated with cardiopathy. In this case it is dilated cardiomyopathy.


Conduction abnormalities


Reading level

1 / 3