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 174

ECG 174


Baseline rhythm

Regular sinus at 40 bpm.P-waves: normal.PR interval: normal.QRS : Axis and duration : normal.ST segment: normal.T-waves: normal.QT interval: normal.


P wave modifying T wave.


Doublets of atrial extrasystoles with prolonged PR interval.


The first two complexes of the precordial leads occur at a more rapid rate and we can see that their T-wave is different from the others because it contains an extrasystolic P’-wave conducted with a prolonged PR interval.




Reading level

1 / 3