
First-degree AV block
First-degree AV block is not considered a “true blockage,” but rather a slowing of electrical conduction between the atriaThe atria are the two upper chambers of the heart. They act as reservoirs for blood that will fill the ventricles. and the ventricles. It differs from second- or third-degree AV block, where some — or even all — impulses fail to pass through the AV node.










