How do the hearts electrical impulses normally flow?
In the heart we have a normal pacemaker. This is a specialized group of cells in the heart’s right upper chamber (right atrium). Somewhere between 60 and 100 times a minute, this pacemaker sends out an electrical impulse. This impulse then travels throughout the heart on a specified route. As the impulse passes through, the heart muscle contracts (beats). The impulse first travels through the upper chambers (the atria). Before it can go to the lower chambers (the ventricles), it must pass through one small group of cells called the A-V node. The A-V node is located between the atria and the ventricles. After the impulse goes through this A-V node, it goes along a track called the bundle of His (hiss). From there, this bundle divides into a right bundle and a left bundle. These two bundles go to the right and left lower chambers of the heart. All of this is much like following the roads on a freeway map. What is bundle branch block? Normally, the electrical impulse travels down both the
