The electrical axis of the heart is the mean direction of the action potentials traveling through the ventricles during ventricular activation (depolarization). The QRS complex, which represents ventricular depolarization, is used for the determination of the electrical heart axis.
The term, electrical heart axis, usually refers to the electrical axis in the frontal plane as measured by the limb leads.
Normally, the vector representing the heart axis originates from the AV node, where ventricular activation is initiated, and points towards the left ventricle. This is because the massive left ventricle dominates the process of ventricular depolarization.
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