Heart block means that electrical signals controlling the heartbeat are delayed or blocked.
Heart block concerns the electrical signals that coordinate the heartbeat. It is not the same as a blocked coronary artery, which affects blood flow. The term includes different types or degrees, so the exact wording in the report matters.
An electrocardiogram, often shortened to ECG, records the heart’s electrical activity and can help identify heart block. Some people have no symptoms, while others may experience dizziness, fainting, or breathlessness. The significance depends on the exact type and the wider clinical context.

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