Heart block
The symptoms of heart block depend on the type and severity.
First-degree heart block doesn't cause any noticeable symptoms. Most people are only aware they have the condition when they're tested for an unrelated medical condition. It's only recognised by an electrocardiogram (ECG).
Most people with second-degree Mobitz type 1 heart block won't experience any symptoms. However, some people may have symptoms such as:
People with second-degree Mobitz type 2 heart blocks are much more likely to experience the symptoms listed above. They may also have additional symptoms such as:
Many cases of congenital third-degreeheart block are diagnosed during pregnancy because an ultrasound scan can often detect whether the baby has a slow heartbeat (bradycardia).
If the diagnosis is overlooked during pregnancy, the symptoms of congenital third-degreeheart block won't usually become apparent until the child is older and a greater demand is placed on their heart.
Symptoms of congenital third-degree heart block in older infants or young children include:
Symptoms of acquired third-degree heart block include:
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.
The symptoms of heart block depend on which type you have and how severe it is. Common symptoms include light-headedness, dizziness and fainting.
Heart block can have a number of different causes. It can occur if you have another heart condition or if you take certain medications. A person can be born with heart block (congenital) or it can develop over time (acquired).
Heart block is often detected during routine tests for other conditions. An ECG is the main test that's used for confirming a diagnosis of heart block. Your GP may suspect heart block based on your medical history, family history and a physical examination.
Heart block usually only needs to be treated if it's causing symptoms (symptomatic). However, most cases of acquired heart block need to be treated regardless of whether there are symptoms or not.