Ventricular Fibrillation:
A condition in which the purposeful, forceful, and rhythmic contraction of the ventricle is lost. Ventricular fibrillation is one of several conditions known as "arrhythmias". With ventricular fibrillation, the heart muscle has no purposeful contractile motion, which results in a loss of the pumping action of the heart. Ventricular fibrillation is fatal if not quickly treated. Ventricular fibrillation can be treated with medications, or through an electrical shock known as a defibrillation.
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