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 202

ECG 202


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.


PP interval = double of the baseline PP interval.


Seccond degree 2:1 sino-atrial block.


The presence of a pause with neither a P-wave nor a QRS which is exactly double the baseline PP interval is typical of sino-atrial block. The fact that its duration is a multiple of the baseline PP interval is typical of second degree block, in this case 2:1. Sino-atrial conduction disturbances come under the collective of sinus node disease. They are more difficult to diagnose than A-V conduction disturbances because sinus node activity does not figure on the ECG. More serious problems such as sinus pauses are probable in this patient who is symptomatic with dizzy spells. Pacemaker implantation is indicated in this case.


Conduction abnormalities


Reading level

1 / 3