Sometimes suffer heart of flicker either the atria or ventricles. There arises an electrical chaos causing the pumping function is lost due to muscle contractions cease. Ventricular fibrillation is considered a cardiac arrest and the patient loses consciousness almost immediately. CPR must be started immediately. With an electrical device called a defibrillator, may flicker broken in most cases if treatment is started immediately.
When ventricular fibrillation is defibrillation an emergency measure to bring the heart back to normal operations. Defibrillation is the short power surge that passes the heart through the chest. The treatment takes only a few seconds. The strong surge current "reset" the electrical chaos that occurs