What is this article about?
Basic life support (BLS) is a procedure used to achieve preliminary preservation or restoration of life until advanced life support (ALS) can be performed. It involves establishing and maintaining airway, breathing, circulation and related emergency care using CPR, in addition to using an automated external defibrillator (AED. BLS can only generate about 20 to 30% of normal cardiac output, so it should only be used as a temporary substitute for normal ventilation and circulation. However, early, correctly-performed BLS is associated with better oxygenation, an increased likelihood of successful defibrillation, an increased likelihood that the patient will respond to advanced techniques and consequently, a higher chance of survival.