atrial fibrillationnoun [ U ]
uk/ˌeɪ.tri.əl fɪb.rɪˈleɪ.ʃən/us/ˌeɪ.tri.əl ˌfɪb.rəˈleɪ.ʃən/abbreviation AF specializeda problem in which the heart beats faster than normal and in a way that is not regular, resulting in the atria (= the top spaces) of the heart not emptying properly:
Patients with atrial fibrillation may be fitted with pacemakers.
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