Welcome to the Advanced Cardiac Life Support chapter on the Adult Cardiac Arrest Algorithm. Learn more about the intravenous (IV) and intraosseous (IO) routes to administering drugs safely. This chapter also covers what to do with reversible causes i.e.; hypothermia, hypovolemia, etc. Chapter 9 is a continuation of the scenario presented in the previous chapter. For the full Cardiac Arrest Algorithm, take a look at the chart included in this section. Keywords: intravenous, intraosseous, hypothermia, IV, Amiodarone, Cardiac Arrest Algorithm