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 124

ECG 124


Basic rhythm

Sinus rhythm, regular at 109 bpm.

P waves

Pointed, amplitude slightly increased (II).

PR interval



S1q3T3 pattern, rSR pattern in V1; normal duration.

ST segment


T waves

Negative in III and from V1 to V4.

QT interval

Prolonged (440 ms).


Negatives T waves.
Increased P wave amplitude.
Rigth axis deviation and S wave > R wave.


Right ventricular and atrial strain.


The S1 q3 pattern (evidence of clockwise rotation), the right axis deviation, the incomplete right bundle branch block (rSR pattern in V1) as well as the inversion of the T waves in the precordial leads V1-V3 are signs of right ventricular dilation and strain which strongly suggest a pulmonary embolism.




Reading level

2 / 3