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Home > Conditions & Treatments > Arrhythmia > Ventricular Fibrillation. Ventricular fibrillation is a condition in which the heart's electrical activity becomes disordered. When this happens, the heart's ventricles, the lower chambers that pump blood, contract in a rapid, unsynchronized way. The ventricles flutter rather than beat, causing the heart to pump little or no blood. Ventricular fibrillation is life-threatening and requires prompt treatment. Collapse and sudden cardiac death will follow in minutes unless medical help is provided immediately.
Abnormal rapid stimulation of the ventricles can lead to fibrillation. This can occur during VT or in conditions, such as Wolff-Parkinson-White syndrome, when atrial fibrillation or flutter waves pass rapidly through a bypass tract to the ventricular musculature.