Definition: A chaotic, extremely rapid, highly irregular heart arrhythmia originating in the ventricles. VF causes immediate loss of consciousness, and is invariably fatal within minutes unless it is stopped (usually by using a defibrillator.) VF is the most common cause of sudden death.
Ventricular Fibrillation - VF
By Richard N. Fogoros, M.D., About.com Guide
Updated December 03, 2003
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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