Lessons on electrocardiogram interpretation are available on this website. We also provide an electrocardiogram reference guide covering 40 abnormalities. Practice what you learn with our drills and quizzes.
What is Electrocardiogram Interpretation?
An electrocardiogram records electrical signals produced in the heart across multiple heart beats and produces an ECG tracing (strip) that is analyzed by medical professionals.
An electrocardiogram tracing includes multiple components, representing various phases in a heart beat. These components are designated P, Q, R, S, T and U.
The P wave is the first short upward movement of the ECG tracing. It indicates that the atria are contracting.
The QRS complex, normally begins with a downward deflection, Q; a larger upwards deflection, a peak (R); and then a downwards S wave. This QRS complex represents ventricular depolarization and contraction.
The PR interval indicates the transit time for the electrical signal to travel from the sinus node to the ventricles.
T wave is normally a modest upwards waveform representing ventricular repolarization.
Electrocardiogram Arrhythmia Drills
Our electrocardiogram drills allow you to practice interpretation using several hundred strips, representing about 40 different conditions.
Electrocardiogram Practice Drills
Our electrocardiogram reference guide provides a tracing and synopsis of key features for many types of arrhythmias. Time intervals on the EKG tracing can be measured using our digital calipers.