This document provides information on basic life support (BLS) procedures for responding to cardiac arrest. It outlines the steps of BLS including assessing the victim, performing chest compressions and rescue breathing, and placing an unconscious breathing victim in the recovery position. BLS procedures are described as the first line of defense for restoring oxygenated blood flow after sudden cardiac or pulmonary arrest and include immediately performing chest compressions and ventilation without any equipment other than protective devices. The key steps of BLS response are approach safely, check response, call for help, open airway, check breathing, give 30 chest compressions, and 2 rescue breaths and continuing in cycles until spontaneous circulation returns or medical help takes over.