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 204

ECG 204


Baseline rhythm

Regular at 100 bpm.P-waves: negative in I and aVL, positive in aVR.PR interval: normal.QRS: axis -135 degrees. Duration 100 ms. Micropotentials in the precordial leads with decreased amplitude.ST segment: diffuse changes.T-waves: flat in II, III and aVF and in the precordial leads.QT interval: prolonged at 520 ms.


Negatives P waves, QRS complexes and T waves.
Amplitude of the QRS complex diminishes from V1 to V6.


Dextrocardia with prolongation of the QT interval.


The negative P-waves in I and aVL are either a sign of left atrial activity or due to an error in the placement of the leads. The fact that the amplitude of the QRS only diminishes in the precordial leads is typical of dextrocardia. There is therefore no micropotential in the precordial leads but a normal decrease in the amplitude associated with dextrocardia. The prolongation of the QT interval in this case is secondary to amiodarone treatment.


Various cardiopathy


Reading level

2 / 3