Sydänjohtoverkostoa

Sydänjohtoverkostoa, often translated as the cardiac conduction system, refers to the specialized cells within the heart responsible for generating and transmitting electrical impulses. These impulses coordinate the heart's contractions, ensuring efficient blood circulation. The system begins with the sinoatrial (SA) node, located in the right atrium, which acts as the heart's natural pacemaker. It spontaneously generates electrical signals at a regular rate. These signals then spread across the atria, causing them to contract and pump blood into the ventricles.

The electrical impulse then travels to the atrioventricular (AV) node, situated between the atria and ventricles. Here, the impulse is briefly delayed, allowing the atria to fully empty their blood into the ventricles before the ventricles contract. From the AV node, the impulse passes down the bundle of His, which branches into the left and right bundle branches within the interventricular septum. Finally, these branches lead to the Purkinje fibers, a network that spreads the impulse throughout the ventricular walls, causing them to contract and pump blood out to the body and lungs. Any disruption to this intricate pathway can lead to various cardiac arrhythmias, affecting the heart's rhythm and function.