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 183

ECG 183


Baseline rhythm

Regular at 60 bpm.P-waves: difficult to see but negative in I and aVL.PR interval: prolonged at 320 ms.QRS: prolonged duration at 140 ms. Axis: -60 degrees.ST segment: normal.T-waves: negative in I and aVL.QT interval: prolonged at 500 ms. U-wave.


Negative P waves. Prolonged PR interval.
Left bundle branch block.
Prolonged QT interval and U wave.


Left atrial rhythm. First degree A-V block. LBBBB. Long QT.


The P-waves are difficult to see but on close inspection we can identify them and they are negative in I and aVL which signifies a left atrial rhythm. There is also first degree A-V block. The morphology of the QRS is that of LBBB, and finally, the QT is prolonged.


Ectopic rhythm


Reading level

1 / 3