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 106

ECG 106


Basic rhythm

Sinus rhythm, regular at 69 bpm.

P waves

Bifid with prolonged duration (greater than 110 ms).

PR interval

Short (less than 120 ms).


Starts with a delta wave. Tall R wave in the precordial leads (greater than 35 mm).

ST segment

Depression in I, aVL and from V4 to V6.

T waves

Negative in I, aVL and from V4 to V6.

QT interval



Short PR interval with ∂ wave.
Increased QRS complex amplitude.
Bifid P wave with prolonged duration > 100 ms.


WPW syndrome, left atrial hypertrophy, left ventricular hypertrophy.


The short PR interval and the delta wave are signs of WPW syndrome which in this case is associated with left ventricular hypertrophy given the tall R waves in the precordial leads. There are also classic signs of left atrial hypertrophy. In this case, the patient has aortic stenosis as well as WPW syndrome.




Reading level

2 / 3