Atrial fibrillation: Abnormal irregular heart rhythm with chaotic generation of electrical signals in the atria of the heart. Familiarly called atrial fib.
Library > Miscellaneous > Britannica Concise Encyclopedia Irregular rhythm (arrhythmia) of contraction of the atria (upper heart chambers). The most common major ...
Atrial fibrillation — Comprehensive overview covers symptoms, causes and treatment of this common heart disorder.
What Are the Symptoms of Atrial Fibrillation? Many patients with atrial fibrillation have no symptoms and are unaware of the abnormal heart rhythm.
Learn about atrial fibrillation, a rapid, irregular heart rhythm.
Atrial fibrillation is the most common sustained arrhythmia, increases with age, and presents with a wide spectrum of symptoms and severity. Paroxysmal, persistent, and ...