Atrial Ventricular Block Physiology
Normally, electrical impulses in the heart stimulate the atria and ventricles to contract in a coordinated pattern. This allows the atria to contract first, forcing blood into the ventricles, and then the ventricles contract, pumping blood to the lungs and body.
Electrical impulses originate in the sinoatrial node (SA node), located within the right atrium. The SA node is the heart's pacemaker. The SA node sends an electrical impulse that is conducted to the ventricles by way of the atrioventricular node and a network of electrical pathways. These pathways are called the Bundle of HIS.
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