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 069

ECG 069


Basic rhythm

Sinus rhythm at 75 and 100 bpm.

P waves


PR interval



2 morphologies: 1) narrow QRS complexes, normal axis, duration and morphology; 2) wide QRS complexes (170 ms), predominant R wave in V1, rS pattern in V6, right axis deviation.

Segment ST

For the narrow QRS complexes: ST segment elevation in II, III, aVF, V5 and V6 and depression in aVL and from V1 to V3.

T waves

Within the ST segment for narrow QRS complexes in the same leads.

QT interval

Normal. Wide QRS complexes, diffuse and non-specific changes in the terminal phase.


ST segment elevation.
Regular wide complexes rhythm.


Accelerated idioventricular rhythm due to acute inferior infarction.


The narrow QRS complexes are preceded by a P wave. The baseline rhythm is sinus rhythm at 75 bpm. In the precordial leads, following a visible P wave before the first wide complex, the rhythm is irregular with a frequency slightly higher than the baseline rhythm (between 80 and 100 bpm) with complete dissociation between the P waves and QRS complexes (AV dissociation). This is an accelerated idioventricular rhythm, which typically occurs after an acute infarction, during the reperfusion phase after effective thrombolysis. The ST segment elevation in the inferior leads and in the last precordial leads allows the ischaemic lesion to be located to the inferior region.


Ischemia and myocardial infarction


Reading level

1 / 3