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 182

ECG 182


Baseline rhythm

Irregular, about 120 to 130 bpm.P-waves: normal but not always followed by a QRS.PR interval: short at 130 ms.QRS: prolonged duration at 140 ms. Preceded by a spike.ST segment: depressed from V4 to V6.T-waves: negative in II, III and aVF and from V4 to V6.QT interval: normal.


Spikes without QRS complexes.
Spikes without QRS complexes.


Pacemaker dysfunction.


We see clearly that when the P-waves are followed by a QRS, the latter is preceded by a spike confirming the presence of a DDD pacemaker. There is a dysfunction of this latter because several spikes are not followed by a QRS complex, indicating capture failure. Sometimes there is a ventricular extrasystole where there is no QRS, which corresponds to an escape rhythm.




Reading level

2 / 3