Approximately 350,000 adults in the US experience out-of-hospital cardiac arrest each year, with only around 10% surviving. The key factors that determine survival are bystanders administering CPR and the use of an automated external defibrillator, though currently only around 40% receive CPR and 12% have an AED used. High quality CPR, early defibrillation if a shockable rhythm is detected, and advanced medical care upon emergency response team arrival can improve chances of survival. Post-cardiac arrest care is also important for recovery.