Heart block happens when the heart’s electrical signals are too slow or are interrupted.

What is a heart block?

A heart block is a type of arrhythmia called bradycardia. It happens when the heart’s electrical signals are too slow or are interrupted.

It can be a complication of other heart diseases or a side effect from medication, heart attack, surgery or infection.

What are the symptoms of a heart block?

Common symptoms of a heart block include:

  • Dizziness
  • Fatigue
  • Chest pain
  • Fainting

What are the causes of a heart block?

Heart block is most likely to occur in seniors. The chances of getting a heart block are higher if you have the following:

How is a heart block diagnosed and treated?

Your doctor will review your medical history and may ask you to have an electrocardiogram (ECG).

A heart block can be treated with an implantable pacemaker to provide regular electrical stimulation and help the heart beat in a regular rhythm. See our arrhythmia page for more information.

Resources

The following resources have information about the causes, symptoms, diagnosis, and treatment for heart block: