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 003

ECG 003


Basic rhythm

Sinus rhythm, regular at 120 bpm.

P waves


PR interval



Normal axis, increased amplitude in both right (RV1 > 8 mm) and left precordial leads (V3 to V5, RV5 > 35 mm).

ST segment


T waves

Inverted in V1-V2.

QT interval



Increased R wave amplitude in V1.
Sinus tachycardia.
Increased R wave amplitude in V3 to V5.


Sinus tachycardia, biventricular hypertrophy.


The left ventricular hypertrophy, indicated by the large amplitude R waves in the left precordial leads, masks the signs of the right ventricular hypertrophy as only one large amplitude R wave is shown in V1. The axis deviation (left axis deviation in hypertrophy on the left, right axis deviation in hypertrophy on the right) cancel each other out, and as a result the QRS axis remains within the normal range.




Reading level

1 / 3