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 194

ECG 194


Baseline rhythm

Regular sinus at 88 bpm.P-waves: normal axis.PR interval: normal.QRS: normal axis, micropotentials in all leads. Incomplete RBBB.ST segment: normal.T-waves: positive deflection at the end of the T-wave.QT interval: prolonged at 500 ms.


Prolonged QT interval.


Prolongation of the QT interval with hypocalcemia. Micropotentials of the QRS complex.


This tracing is recorded from a heart transplant patient. Micropotentials are quite often encountered in everyday practice and in this patient are secondary to obesity. The incomplete RBBB is classically encountered in heart transplant patients and are secondary to a dilatation of the right heart chambers. Hypocalcemia, present in this patient, is a classic cause of prolongation of the QT interval. The other causes are the long QT syndrome, subarachnoid hemorrhage, certain medication (amiodarone in particular, antidepressants, antiarrhythmics, antiallergy drugs, etc.), thyroid disease and ischemia.


Electrolytes disorder and intoxication


Reading level

2 / 3