atrial fibrillation
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
An irregular and often rapid heart rhythm arising from disorganised electrical activity in the atria, which raises the risk of stroke.
She was started on an anticoagulant because her atrial fibrillation put her at high risk of a stroke.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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