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 131

ECG 131


Basic rhythm

Regular with wide QRS complexes, not preceded by a P wave, except for the 6th complex which is a narrow QRS complex.

P waves


PR interval



Normal duration and axis for the narrow complex. The slightly widened 7th complex is also preceded by a P wave. The first 3 QRS complexes are followed by a retrograde P wave, as are the last 3 complexes in the precordial leads. As for the rest, there is a dissociation between the P waves and the QRS complexes.

QT interval



Dissociated P wave.
Capture beat.
Fusion beat.


Accelerated idioventricular rhythm (AIVR). A-V dissociation and intermittent VA conduction.


The ventricular-atrial conduction is intermittent. It can be seen in the P waves which follow the QRS complexes. Outside these phases, there is a sinus rhythm which is sometimes conducted to the ventricles in the normal way (narrow QRS complexes), and sometimes with fusion QRS complexes.


Ischemia and myocardial infarction


Reading level

2 / 3