Keywords advanced life support basic life support cardiopulmonary resuscitation Learning objectives By reading this article you should be able to: • Describe trends in the epidemiology of cardiac arrest. • Be aware of changes in adult basic and advanced life support (ALS) guidelines. • Appreciate that ALS may be modified in special circumstances. • Be up to date in post-resuscitation care. Key points • About 8% of people having an out-of-hospital cardiac arrest survive to discharge.