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A pacemaker is a device or system that sends electrical impulses to the heart in order to set the heart rhythm. A pacemaker can be a natural pacemaker of the heart (the sinoatrial node) or it can be an electronic device that serves as an artificial pacemaker.

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    • Low Blood Pressure (Hypotension) Low blood pressure, also referred to as hypotension, is blood pressure that is so low that it causes symptoms or signs due to the...learn more »
    • Dizziness Dizziness is a symptom that is often applies to a variety of sensations including lightheadedness and vertigo. Causes of...learn more »
      In This Article
      Dizziness Article
      • Dizziness facts
      • Introduction to dizziness (feeling dizzy)
      • What are some common causes of dizziness?
      • Low blood pressure
      • Postural or orthostatic hypotension
      • High blood pressure
      • Diabetes
      • Endocrine diseases
      • Hyperventilation
      • Heart conditions
      • Vasovagal syncope
      • Dizziness and vertigo
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      • When should I call the doctor for dizziness?
      • How is dizziness diagnosed?
      • How is dizziness/vertigo diagnosed?
      • How is dizziness treated?
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      In This Article
      Arrhythmia Article
      • Introduction to Arrhythmia
      • What causes an arrhythmia?
      • What are the types of arrhythmias?
      • What are the symptoms of arrhythmias?
      • How are arrhythmias diagnosed?
      • How are arrhythmias treated?
      • What medications are used to treat arrhythmias?
      • What lifestyle changes should be made?
      • What is electrical cardioversion?
      • What is a pacemaker?
      • What is an implantable cardioverter-defibrillator (ICD)?
      • What is catheter ablation?
      • What is heart surgery?
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      In This Article
      Fainting (Syncope) Article
      • Fainting (syncope) Facts
      • Introduction to fainting (syncope)
      • What causes fainting (syncope)?
      • Heart rhythm changes
      • Heart structural conditions
      • Heart valve conditions
      • Sudden cardiac death
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      • Vasovagal syncope
      • Anemia
      • Dehydration
      • Orthostatic hypotension
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      • Electrolyte imbalance
      • Other medications and drugs
      • Pregnancy
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      • What is the treatment for fainting (syncope)?
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      In This Article
      Fatigue Article
      • Fatigue Facts
      • Fatigue introduction
      • What causes fatigue?
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      • How is the cause of fatigue diagnosed?
      • What is the treatment for fatigue?
      • Can fatigue be prevented?
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      In This Article
      Heart Attack Article
      • Heart attack facts
      • What is a heart attack?
      • What causes a heart attack?
      • What are the symptoms of a heart attack?
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