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 033

ECG 033


Basic rhythm

Sinus rhythm at 92 bpm.

P waves


PR interval

180 ms.


Narrow, axis -10°. Q wave in II and aVF (rS in III), early transition in V2 with R wave of 14mV. Monomorphic ventricular quadrigeminy (S wave predominant in V1, horizontal axis). Peripheral micropotentials.

QT interval

Slightly prolonged at 460 ms.


Q wave in the inferior leads (old inferior infarction).
Premature ventricular contraction.


Old inferior myocardial infarction with ventricular quadrigeminy.


Although it is small, the Q wave in the inferior leads is significant with the microvoltage of these QRS complexes. The large R wave in V2 is abnormal and corresponds to an infarction that is also in a posterior location. The ventricular monomorphic extrasystole should be compared to the complexes of the next ECG.


Ischemia and myocardial infarction


Reading level

1 / 3