• Healthcare Professional

  • Media

  • Healthcare Professionals

  • Media

  • Sitemap

  • Contact Us

  • Terms of Use

  • Privacy Policy

your health

What is Atrial Fibrillation?

Atrial Fibrillation (AFib) is a form of arrhythmia – when your heart beats out of rhythm. When this occurs the Atria (upper chambers of the heart) do not pump in the usual way, this may cause blood to pool and clot. A stroke can occur when a part of the clot can break off and travel up the bloodstream and lodges in the brain. 
The causes of Atrial Fibrillation are often unclear, and a lot of patients never identify any underlying cause. However, there are some risk factors which increase your likelihood of developing AFib, including: 

  • Ageing 
  • Coronary heart disease, previous heart attack
  • Heart valves disease  
  • Heart failure
  • Increased blood pressure 
  • Overactive thyroid gland
  • Heart defects you’re born with (congenital)
  • Lung infections, such as pneumonia
  • Pulmonary embolism (blood clots)
  • Lung or heart surgery 
  • ​​​​​​​Exposure to stimulants, such as medications, caffeine, tobacco or alcohol abuse*
Learn More about AFib   
​​​​​​​PP-ELI-IRL-0528 Date of Preparation October 2021 
  • Healthy Living
  • Discover HARV
  • About Atrial fibrillation
  • Diseases and Therapy Areas
your healthHealthy LivingDiscover HARVAbout Atrial FibrillationDiseases and Therapy Areasabout pfizerAbout Pfizer IncAbout Pfizer in IrelandMission,Statement and ValuesCompany HistoryOur commitment to innovationInnovation in IrelandContact usworking responsiblyCorporate ResponsibillityEnvironmental AwarenessEFPIAcareersFind a Job at PfizerInnovation that's changing Life and CareerOur Location and cultures