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 180

ECG 180


Baseline rhythm

Regular narrow complex tachycardia at 170 bpm.P-waves: visible and remote (120 ms) from the QRS.PR interval: non-measurable.QRS: normal duration and axis.ST segment: quite diffuse depression.T-waves: normal.QT interval: normal.


Narrow QRS complex tachycardia with P' waves visibles in the T wave. RP' interval < P'R interval.


Atrioventricular tachycardia utilising an accessory pathway.


This is a narrow complex tachycardia at a rate of about 170 bpm. Flutter is therefore probably unlikely. There are P’-waves remote from the QRS complexes and there is a P’-wave for each QRS complex. These features are characteristic of an atrioventricular tachycardia utilising an accessory pathway probably located in the postero-septal region because the P’-wave is negative in II, III and aVF.


Narrow QRS complex tachycardia


Reading level

2 / 3