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Atrial fibrillation (AF or Afib) is the most common type of irregular heartbeat. It is found in about 2.2 million Americans. It increases with age. If you have AF, the impulse does not travel in an orderly fashion through the atria. Instead, many impulses begin simultaneously and spread through the atria and compete for a chance to travel through the AV node.
The firing of these impulses results in a very rapid and disorganized heartbeat. The rate of impulses through the atria can range from 300 to 600 beats per minute. Luckily, the AV node limits the number of impulses it allows to travel to the ventricles. As a result, the pulse rate is often less than 150 beats per minute, but this is often fast enough to cause symptoms. The AV node limits the number of impulses that travel to the ventricles.
What Are the Symptoms of Atrial Fibrillation?
You may have atrial fibrillation without having any symptoms at all. If you have symptoms, they may include:
- Heart palpitations (a sudden pounding, fluttering, or racing feeling in the chest).
- Lack of energy; feeling over-tired.
- Dizziness (feeling faint or light-headed).
- Chest discomfort ( pain, pressure, or discomfort in the chest).
- Shortness of breath (difficulty breathing during normal activities or even at rest).