Third-degree heart block: The electrical signal from the atria to the ventricles is completely blocked.Type II, also called Mobitz Type II: While most of the electrical signals reach the ventricles every so often, some do not and your heartbeat becomes irregular and slower than normal.The electrical signal gets slower and slower until your heart actually skips a beat. Type I, also called Mobitz Type I or Wenckebach’s AV block: This is a less serious form of second-degree heart block.In second-degree heart block, the impulses are intermittently blocked. Second-degree heart block is classified into two categories: Type I and Type II.First-degree heart block: The electrical impulse still reaches the ventricles, but moves more slowly than normal through the AV node.Heart block can be first, second or third degree, depending on the extent of electrical signal impairment. The result is a heart that doesn’t function effectively, meaning your heart beats slowly or skips beats and it can’t pump blood through its chambers and out to the body as a normal heart would. If you have heart block, the electrical signal does not travel through the AV node to the ventricles. The AV node is a cluster of cells that connect the electrical activity – like a bridge – from the top chambers of your heart to the bottom chambers. Normally, electrical signals travel from the upper chambers of your heart (atria) to the lower chambers (ventricles). The condition is also called atrioventricular (AV) block or a conduction disorder. ![]() ![]() ![]() Heart block is a problem with your heart's electrical system, which makes your heart beat and controls your heart rate and rhythm. Tchou, MD, talks about blocked impulses in the heart What is heart block?
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