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 152

ECG 152


Baseline rhythm

Regular at 100 bpmP-waves: normal axis, presence of a second P’-wave in the T-wave.PR interval: normalQRS: -45 degree axis. Duration > 120 ms. rSR’ in V1.ST segment: normalT-waves: peaked in II and in the precordial leadsQT interval: normal


QRS complex with right bundle branch block morphology.
P' waves visibles between the QRS complexes.


3:1 atrial flutter with RBBB and left anterior hemiblock.


A quick glance at the tracing could lead one to conclude that it shows sinus tachycardia. However, on careful analysis of the T-wave, it becomes clear that there are P’-waves which make them appear very peaked in appearance in leads II and V2-V5. Carotid sinus massage (cf next ECG) allowed the diagnosis of atrial flutter with 3:1 A-V conduction to be confirmed.




Reading level

2 / 3