An<unk>  is an additional route for impulse conduction between the atrium and the ventricle that generally does not involve the atrioventricular node (AV node).  Conduction through<unk> s usually exhibit electrophysiological properties different from the AV node.  From an anatomical viewpoint, there are at least five connections that bypass the AV node.
Accessory pathway
Subluxation
Fukuyama coupling
Pulsatile flow
Convergence insufficiency
Clubbing pathophysiology
Friction
No-reflow phenomenon