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How Does a Pacemaker Work?

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The Need for a Pacemaker

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The body generates electrical impulses that cause the heart to beat. In some people, those electrical impulses don't happen in a normal pattern, which can cause the heart to beat too slowly, too fast or irregularly. A very slow heartbeat can lead to fatigue, lightheadedness, dizziness and fainting. In patients who are at risk for a very slow heart rate, doctors often recommend a pacemaker.

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Understanding How Pacemakers Work

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Disorders in the heart's electrical system can lead to arrhythmias, or an abnormal heart rhythm. Some patients who have been diagnosed with a slow heart rate, known as bradycardia, may require a pacemaker. A pacemaker is a device that is implanted in the chest and can correct a slow heartbeat.

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What Is a Pacemaker?

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A pacemaker is a small device that sends electrical impulses to your heart to help control your heartbeat so your body gets blood and oxygen. © AHA

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Related Learning

  • Echocardiogram (Echo)
  • Electrocardiogram
  • Cardiac Stress Test
  • Coronary Angiography
  • Coronary Angioplasty
  • Coronary Stenting: What to Expect
  • Pacemaker Implant Procedure
  • Understanding Implantable Cardioverter Defibrillators (ICD)
  • Preparing for ICD Implant Procedure

VA Long Beach Healthcare System
5901 E. 7th St.
Long Beach, CA 90822
562-826-8000

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