2.1 Overview
In Wolff-Parkinson-White (WPW) syndrome, an extra electrical pathway between atrium and ventricle causes an abnormal conduction to the ventricles. An AP is an aberrant cardiac muscle bundle that connect the atrium to the ventricle, usually at the atrioventricular (AV) annulus. Majority of AV accessory pathway are make up by working myocardial cells: conduction over those AP is mediated by sodium current with an all or none conduction capacity and non decremental electrical properties.