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 175

ECG 175


Baseline rhythm

Regular at 81 bpm.P-waves: difficult to see but positive in I and V1.PR interval: normal.QRS: duration prolonged at 160 ms. Axis -60 degrees. Micropotentials in the peripheral leads.ST segment: normal.T-waves: negative from V1 to V4.QT interval: normal.


Right bundle branch block type.
P waves between QRS complexes.


Right atrial rhythm with RBBB.


The P-waves are not clearly seen in the peripheral leads but clearly discernible in the precordial leads. On close inspection, we notice that the axis of these P-waves is not normal (bifid in I, negative or bifid in the precordial leads). It is this abnormal axis that allows us to make a diagnosis of atrial rhythm. The increased width of the QRS complex is due to RBBB. The micropotentials and the difficulty of the visualization of the P-waves are the consequence of obesity.




Reading level

3 / 3