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 157

ECG 157


Baseline rhythm

Regular at 58 bpm.P-waves: visible with difficulty.PR interval: non measurable.QRS: normal with left axis deviation (-45°).ST segment: normal.T-waves: normal.QT interval: normal.


Oscillations of the baseline without modifications of the RR interval.


Normal sinus rhythm.


One can clearly see an oscillation of the baseline in almost all the leads. One could think of atrial fibrillation if one looks quickly at the tracing. However, on regarding it properly, one sees regular p-waves in V1 which correspond to sinus rhythm. Another piece of evidence in support of sinus rhythm is the perfect regularity of the QRS complexes. This can be the case during atrial fibrillation when A-V block co-exists.




Reading level

1 / 3