The plural form of fibrillation; multiple instances or types of irregular muscle contractions.
Simply the plural of 'fibrillation' formed by adding '-s'. In medical contexts, this allows doctors to discuss different fibrillations occurring simultaneously or in different patients.
When doctors talk about 'fibrillations' they might be referring to both atrial and ventricular fibrillations happening at the same time, which is why emergency rooms have multiple treatment protocols ready.
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