Sudden Cardiac Arrest According to the Heart Rhythm Foundation, Sudden Cardiac Arrest (SCA) is a leading cause of death in the United States, accounting for an estimated 325,000 deaths each year. What is Sudden Cardiac Arrest? Sudden cardiac arrest (SCA) is an electrical disturbance in the heart that prevents it from beating properly. During SCA, the ventricles flutter in a phenomenon known as ventricular fibrillation, making them unable to deliver blood to the body. The heart responds by quivering, rather than beating in a normal fashion. Blood flow to the brain is reduced to the point that the person loses consciousness and collapses. Unless emergency treatment is provided quickly, death usually follows. Anyone is at risk There are no warning signs associated with SCA. It often affects those who have experienced previous episodes of SCA, heart attacks, or heart failure; but it can also strike someone with absolutely no history of heart problems. Treatment includes: CPR, to keep the blood flowing through the body Defibrillation, to restore a normal rhythm to the heart Every minute counts Medical attention must be administered as soon as possible after the victim collapses; the chances for survival decrease 10% with every minute you wait. The average SCA victim is middle-aged or elderly, although some victims are in their 30s or 40s. More than 70 percent of SCAs occur in the home, which is why home AEDs have the potential to save the lives of countless loved ones struck by cardiac arrest.