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 059

ECG 059


Basic rhythm

Irregular (approximately 115 bpm).

P waves

None. Baseline oscillations (F waves) in the inferior leads and in V1; rate 260/min.

PR interval

Not interpretable, ventricular rate variable (1/2 to 1/5 response).


Axis + 100°, duration and morphology normal.

ST segment

Slight depression from V3 to V6.

T waves

Anomaly difficult to interpret because of the superimposition of the F waves.


F waves.


Atrial flutter with right axis deviation.


The F waves are in a sawtooth pattern in the inferior leads and in V1 (where they are usually easiest to identify) are this pattern is typical for an atrial flutter. The association between this arrhythmia and a right axis deviation indicates a right ventricular strain with pulmonary hypertension, mitral stenosis or atrial septal defect (ASD). In this 65-year-old patient, this was an ostium secundum type ASD.


Narrow QRS complex tachycardia


Reading level

1 / 3