atrial fibrillation
An irregular and often rapid heart rhythm disorder affecting the heart's upper chambers, increasing stroke risk.
Full Definition
Atrial fibrillation (AF or AFib) is the most common sustained cardiac arrhythmia, characterized by rapid, irregular electrical activity in the atria leading to ineffective atrial contraction and irregular ventricular response. The condition significantly increases thromboembolic risk, particularly stroke, due to blood stasis in the left atrial appendage. Classification includes paroxysmal (self-terminating), persistent (lasting >7 days), long-standing persistent (>12 months), and permanent atrial fibrillation, each requiring different management approaches including anticoagulation, rate control, and rhythm control strategies.
Usage
Usage note: Use 'atrial fibrillation' in full on first mention, then 'AF' or 'AFib' in subsequent references.
In Context
- "The patient was diagnosed with paroxysmal atrial fibrillation and started on anticoagulation therapy." — Cardiology consultation note
- "Rhythm monitoring revealed persistent atrial fibrillation with a controlled ventricular response." — Telemetry unit report