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 208

ECG 208


Baseline rhythm

Regular tachycardia at 150 bpm.P-waves: visible halfway between the QRS complexes – in aVF and III.PR interval: 200 ms.QRS: slightly broadened (100 ms). Axis -45º.ST segment: depressed from V2 to V4.T-waves: negative in V2, V3 and V4.QT interval: normal.


Wide QRS complex tachycardia. Right bundle branch block morphology with r/s ration < 1 in V6.
Q wave > 40 ms.


Ventricular tachycardia with retrograde conduction.


This is a tachycardia involving a QRS complex of 100 ms, so not broad. The morphology of the QRS in V1 is of the type RBBB with an r/s <1 in V6. This suggests a ventricular tachycardia. In addition, in aVR there is a q-wave with a duration of > 40 ms. All these features point to ventricular tachycardia. The fact that the QRS complexes are not very broad is due to the fact that the tachycardia originates from a location close to the normal conduction pathway.




Reading level

3 / 3