Arrhythmia is the medical term used to describe an abnormal rhythm of the heart. The type and severity of the rhythm problem can vary in patients. If the heartbeat is too slow, it is called a bradyarrhythmia or bradycardia. If it is too fast, it is called a tachyarrhythmia or tachycardia. A normal heart rate is between 60 and 100 beats per minute but there are many exceptions.

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The symptoms of a slow heart beat include:

  • Fatigue
  • Dizziness
  • Lightheadedness
  • Fainting or near-fainting spells

The symptoms of a rapid heart beat include:

  • Palpitations
  • Dizziness
  • Light-headedness
  • Fainting or near fainting