What is complete heart block?

See below: Electrical impulses which originate in the upper chambers (atria) cannot reach the lower chambers (ventricles) due to an electrical interruption. When this occurs, the lower chambers continue to beat, but at a very slow rate, typically in the 30s. While some people have no or few symptoms, typically people feel tired, dizzy, and may pass out. Pacemaker therapy is often necessary.

Heart block: Third-degree atrioventricular block or complete heart block, is a disorder of the cardiac conduction system where there is no conduction through the atrioventricular node . Therefore, complete dissociation of the atrial and ventricular activity exists.It results from various pathologic states causing infiltration, fibrosis, or loss of connection in portions of the healthy conduction system.