Medical glossary
Atrial Fibrillation (AFib)
An irregular, often fast heart rhythm that raises stroke risk.
Definition
AFib is the most common sustained arrhythmia. Instead of a coordinated beat, the atria quiver. It can cause palpitations, fatigue, or no symptoms at all — but untreated, it multiplies stroke risk five-fold. Treatment: rate control + anticoagulation.
See also
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Glossary entries are general reference, not medical advice for any specific person.