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 205

ECG 205


Baseline rhythm

Regular sinus rhythm at 55 bpm.P-waves: normal.PR interval: prolonged when it is measurable.QRS: normal.ST segment: normal.T-waves: normal.QT interval: normal.


Not conducted P wave.


Isorhythmic dissociation with atrial extrasystoles and first degree A-V block.


We see that the first QRS complexes are preceded by a P-wave with a prolonged PQ interval which corresponds to first degree A-V block. Thereafter, the P-waves are visible right at the beginning of the QRS and are not conducted. This is typical isorhythmic dissociation with a nodal rhythm. Furthermore, we see that the last complex in the precordial leads is an extrasystole with a P’-wave buried in the T-wave of the preceding complex. This arrhythmia is absolutely harmless.


Ectopic rhythm


Reading level

1 / 3