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Signs and symptoms depend on the type of heart block you have. First-degree heart block may not cause any symptoms. Signs and symptoms of second-and third-degree heart block include: 1  Fainting. 2  Dizziness or light-headedness. 3  Fatigue (tiredness). 4  Shortness of breath.
In people with heart block the electrical pulses that control the heart rate are disrupted, causing the heart to beat more slowly. It's a type of arrhythmia, which is a medical term used to describe problems with the rate or rhythm of the heartbeat.There are three levels of heart block (see below), and usually only the most serious type causes symptoms. This type of heart block is known as a complete, or third-degree, heart block.he pulse is sent to another group of cells, called the atrioventricular node (AV node), which relays the pulse to the two lower chambers of the heart (the ventricles). A heart block occurs if the transmission of the pulse between the SA node, the AV node and the ventricles is interrupted.