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ventricular fibrillation n very rapid uncoordinated fluttering contractions of the ventricles of the heart resulting in loss of synchronization between heartbeat and pulse beat abbr. VF,{{}}V-fib
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(VF) (VFib) an arrhythmia characterized by fibrillary contractions of the ventricular muscle because of rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle; it is an expression of randomized circus movement or of an ectopic focus with a very rapid cycle.
Ventricular fibrillation, characterized by an irregular undulating baseline.
Medical dictionary. 2011.