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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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    • Atrial Fibrillation (AFib) Atrial fibrillation or AFib is an abnormality in the heart rhythm which involves irregular and often rapid beating of the heart....learn more »
    • Heart Attack Heart attack happens when a blood clot completely obstructs a coronary artery supplying blood to the heart muscle. A heart attack...learn more »
      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?
      • What are the complications of a heart attack?
      • What are the risk factors for atherosclerosis and heart attack?
      • How is a heart attack diagnosed?
      • What is the treatment for heart attack?
      • What are the risk factors for heart attack in women?
      • What are the symptoms of heart attack in women and how is heart attack diagnosed?
      • How is heart attack in women treated?
      • What about hormone therapy and heart attack in women?
      • What is new in heart attack?
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    • Ventricular Septal Defect A ventricular septal defect (VSD) is a congenital heart malformation. A VSD is a hole in the wall of the heart's two lower...learn more »
      In This Article
      Ventricular Septal Defect Article
      • Ventricular septal defect facts
      • What is a ventricular septal defect (VSD)?
      • How common is a VSD?
      • What is the normal design of the heart?
      • How do VSDs cause problems?
      • How is a VSD diagnosed? What are the symptoms of a VSD?
      • What if the VSD is small?
      • How is a small VSD treated?
      • What if the VSD is large?
      • How is a large VSD treated?
      • What types of surgery are available to correct a VSD?
      • What is the outlook (prognosis) after a VSD is repaired?
      • What are complications of VSD surgery?
      • What about unusual cases of VSD?
      • What are long-term precautions with VSDs?

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