Pediatrics and Pediatric Cardiology

Cardiac Electrophysiology

The only electrical communication between the atria and ventricles is through the atrioventricular (AV) node. It is distinguished by very slow electrical conduction, which ensures that atrial contraction is completed before ventricle activation. The AV node is connected to the ventricular conducting system, which includes the atrioventricular bundle (His bundle), the left and right bundle branches, and the Purkinje fibre system. The ventricular conducting system is made up of columns of specialised myocytes that contain a trace of contractile protein. Cells' large diameter reduces electrical resistance and promotes fast conduction.