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 188

ECG 188


Baseline rhythm

Irregular, varying between 85 and 130 bpm.P-waves: normal.PR interval: prolonged when the P-wave is followed by a QRS complex.QRS: 3 different morphologies with variable duration and axis.T-waves: variable.QT interval: normal.


P wave with right bundle branch block.
The first QRS complex is a premature beat and the second one is a fusion beat.
Second degree A-V block following a fusion beat. Because of the ventricular extrasystole the A-V pathway are still refractory.


Sinus tachycardia with RBBB. Intermittent second degree A-V block. Ventricular extrasystoles with doublets.


We see P-waves with are normally conducted to the ventricles sometimes with RBBB. The broad QRS complexes are ventricular extrasystoles by virtue of their morphology and the fact that there are fusion beats. The fusion beats are preceded by a P-wave hidden in the T-wave of the ventricular extrasystole, therefore is not visible. Due to the ventricular arrhythmia there is second degree A-V bock. This stems from the ventricular extrasystole which has rendered the A-V conduction pathway refractory.




Reading level

3 / 3