Atrial Fibrillation

**Semantic type:** Disease or Syndrome

**Definition:** A disorder characterized by an electrocardiographic finding of a supraventricular arrhythmia characterized by the replacement of consistent P waves by rapid oscillations or fibrillatory waves that vary in size, shape and timing and are accompanied by an irregular ventricular response. (CDISC)

**Synonyms:** - AF - AFib - Atrial fibrillation