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 108

ECG 108


Basic rhythm

Sinus rhythm, regular at 75 bpm.

P waves

Occasionally visible in V1, with significant oscillations in the baseline.

PR interval



QS pattern in III and aVF; widespread increase in amplitude, normal duration.

ST segment

Elevation from V1 to V3, depression in V5 and V6.

T waves

Negative in V5 and V6.

QT interval



Baseline oscillations.
Q wave.
ST segment depression.
P wave.


Interference in the recording. Previous inferior infarction. Left ventricular hypertrophy.


Initially, the baseline oscillations resemble those seen with atrial fibrillation, but this is quickly ruled out since the QRS complexes are regular. In addition, P waves can be seen in the precordial leads. This trace is contaminated by the patient's Parkinson's tremor.

The axis deviation is due to the Q waves in the inferior leads, evidence of a previous inferior infarction, which also cause the changes in the repolarisation. The increase in R wave amplitude, particularly striking in I, suggests left ventricular hypertrophy.




Reading level

2 / 3