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 179

ECG 179


Baseline rhythm

Regular at 75 bpm.P-waves: non-visbile.PR interval: non-measurable.QRS: broadened (140 ms) and sometimes preceded by a spike. Variable axis.ST segment: depressed in aVL and V6.T-waves: sometimes negative in I and aVL.QT interval: normal.


3 complexes are present. The first is not paced, the second on is a fusion beat and the third one is paced.
QRS complex preceded by a spike.


Atrial fibrillation with a normal-functioning VVI pacemaker.


The first complex on the left is not paced and corresponds to a normal QRS complex with left anterior hemiblock. The next QRS complex is preceded by a spike but is of a different morphology of the following QRS complexes, it is narrower. It corresponds to a fusion, namely a complex which is half spontaneous and half paced. We don’t see P-waves because there is atrial fibrillation.




Reading level

2 / 3