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 173

ECG 173


Baseline rhythm

Irregular tachycardia at 100 bpm.P-waves: normal. There are atrial extrasystoles.PR interval: prolonged.QRS: broadened (160 ms). Right axis deviation.ST segment: depressed in I, II and aVF.T-waves: negative in I, II and aVF.QT interval: normal.


Prolonged PR interval.
Right axis deviation.


Sinus tachycardia with first degree A-V block. LBBB and right axis deviation.


We can see P-waves in the peripheral leads which is consistent with sinus rhythm. There are ectopic P’-waves corresponding to atrial extrasystoles. The PR interval is prolonged because there is first degree A-V block. The QRS complex is broad with typical LBBB morphology in the precordial leads. In addition, we note right axis deviation which is due in this patient to a cardiomyopathy with severe pulmonary hypertension.


Conduction abnormalities


Reading level

1 / 3