Ventricular fibrillation is a very fast, irregular heart beat in the lower heart chambers or ventricles. During an irregular heart beat the heart quivers and pumps little or no blood to the body. Consciousness is lost in seconds. If not treated immediately, irregular heart beat rhythms will cause sudden cardiac arrest.
Some people find they have ventricular fibrillation when a rescue team provides emergency treatment to restart the heart rhythm.
When ventricular fibrillation is diagnosed, an implantable defibrillator is often prescribed to detect VF and then treat it automatically.
Treatment for ventricular fibrillation attempts to control the heart rate and to reset the heart to a more normal rhythm. An implanted defibrillator detects ventricular fibrillation and resets or shocks the heart into a normal rhythm.
With an implanted defibrillator, people with irregular heart beat continue their lives with some lifestyle adjustments.
| 
