Electrocardiogram (ECG) Basics

An integral part of an electrocardiogram (ECG) representing the electrical depolarization of the atria of the heart.

Typically a small positive deflection from the isoelectric baseline that occurs just before the QRS complex.

represents ventricular repolarization, which is the period when the heart's ventricles are repolarizing.

the period when the heart's ventricles are repolarizing

a waveform on an electrocardiogram (ECG) that represents the electrical activity of the heart's ventricles depolarizing

when your heart's electrical system fails, causing your heart to stop pumping

also known as the sinus node, is the heart's natural pacemaker that controls the heart rate

a small, specialized nerve in the heart that connects the electrical systems of the atria and ventricles.

It's located in the right atrium, near the coronary sinus, in an area known as the triangle of Koch.

controls blood flow from the left ventricle to the aorta, the body's main artery.