best cardiac care units near me What sudden Cardiac arrest Cardiac arrest is reversible in most victims if it, s treated within a few minutes .first call 911 for emergency medical services then get an automates external defibrillator if one is available and use it as soon as it arrives CPR immediately and continue until professional emergency medical services if two people are available CPR immediately while the other calls 911 and finds an AED sudden cardiac arrest is a leading cause of death