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atrial fibrillation
at·ri·al fib·ril·la·tion [ àytree əl fìbbrə láysh'n ] (plural at·ri·al fib·ril·la·tions)


noun 
Definition:
 
heartbeat irregularity: an irregularity in heartbeat arrhythmia caused by involuntary contractions of small areas of heart-wall muscle
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