Intermediate
Technical
In the Industry Vocabulary Test
atrial fibrillation
Pronunciation: AY-tree-al fib-rih-LAY-shun
Common heart rhythm disorder characterized by rapid, irregular electrical activity in the heart's upper chambers.
Full Definition
Atrial fibrillation (AF or AFib) is the most common sustained cardiac arrhythmia, characterized by rapid and irregular electrical activity in the atria (upper chambers of the heart). Instead of coordinated contractions, the atria quiver ineffectively, leading to irregular and often rapid heart rates. This can reduce cardiac output and increase the risk of stroke due to blood clot formation in the atria. Treatment focuses on rate control, rhythm control, and anticoagulation to prevent stroke.
Usage
Usage note: May be abbreviated as AF or AFib in clinical notes; distinguish from atrial flutter.
In Context
- "The patient presented with new-onset atrial fibrillation and rapid ventricular response." — Emergency department assessment
- "Anticoagulation is indicated for atrial fibrillation with elevated stroke risk scores." — Cardiology treatment recommendation
Also known as
AF
AFib
A-fib
Contrasted with
normal sinus rhythm
Don't confuse with
atrial flutter
ventricular fibrillation