This document provides information on performing CPR and treating airway obstructions. It begins by defining a heart attack and cardiac arrest. It then outlines the chain of survival and purposes of CPR. Instructions are given for performing CPR on adults, children, and infants, including chest compressions, rescue breaths, and continuation of CPR. Methods for treating mild and severe airway obstructions in responsive and unresponsive victims are described. The focus is on proper techniques to optimize oxygen flow and prevent further injury until emergency help arrives.