Cardiac arrest can occur without warning, in people who have no prior heart problems or symptoms. And the majority of cardiac arrests occur outside of the hospital—which means bystanders are a victim’s first and best chance of getting lifesaving CPR immediately.
Cardiac arrest occurs when this electrical system fails—and the steady rhythm of your heartbeat stops. When that occurs, an AED delivers an electrical charge that can restart the heart’s electrical system.
After directing others for help, scan the body for breathing. If there are no signs of breathing, begin to administer Hands Only CPR. Hands-Only CPR consists of only chest compressions with no additional breaths.