![]() Second-degree heart block means that the electrical signals between your atria and ventricles can intermittently fail to conduct.First-degree heart block might not require treatment of any kind. The electrical signals slow down as they move from your atria to your ventricles. First-degree heart block is the least severe.Heart block is categorized as first-, second-, or third-degree: In most cases of heart block, the signals slow down, but do not completely stop. If the electrical signals can’t move from your atria to your ventricles, they can’t tell your ventricles to contract and pump blood correctly. These signals tell your heart when to beat. When you have heart block, there is interference with the electrical signals that usually move from the atria to the ventricles. ![]() The normal timing of heartbeats is generated in the upper chamber of the heart (atria) in a structure called the sinus node. They tell your heart muscle when to contract, a process known as conduction. ![]() Electrical signals control the beating of your heart.
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