Who is affected by atrial fibrillation

Atrial fibrillation is the most common type of persistent irregular heartbeat (arrhythmia).1

  • More than 2 million people in the United States have atrial fibrillation.
  • The number of people with this condition increases sharply with age and is most common in people older than age 60.
  • Atrial fibrillation affects men slightly more often than it affects women.


  1. Olgin JE, Zipes DP (2008). Atrial fibrillation section of Specific arrhythmias: Diagnosis and treatment. In P Libby et al., eds., Braunwald's Heart Disease, 8th ed., pp. 869–873. Philadelphia: Saunders Elsevier.

Last Updated: December 18, 2008

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