Rapid defibrillation<span> is one of the major contributors to survival of adult victims of sudden cardiac arrest, together with the </span><span>cardiopulmonary resus (CPR). </span>An automated external defibrillator<span> (</span>AED<span>) is a portable device that checks the heart rhythm and can send an electric shock to the heart to try to restore a normal rhythm. That is the reason why is so important in first help to adult survival.</span>