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 166

ECG 166


Baseline rhythm

Regular narrow complex tachycardia at 170 bpm.P-waves: visible, remote (120 ms) from the QRS. Negatives in II, III et aVFPR 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, distant from the QRS complex with RP'< P'R.


Atrio-ventricular tachycardia utilizing an accessory pathway.


This is a narrow complex tachycardia at a rate of around 170 bpm. Flutter is therefore unlikely. There are P’-waves remote from the QRS and there is a P’-wave for every QRS. These features are characteristic for an atrio-ventricular tachycardia utilizing an accessory pathway which is 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