The HeartSine samaritan PAD 500P defibrillator with integrated CPR Advisor is the most innovative device available to support these guidelines, giving rescuers feedback on the effectiveness of their CPR efforts in real time.  CPR, Cardio (heart) Pulmonary (lung) Resuscitation, combines compressing the heart to circulate blood to all the vital organs and, at the same time, breathing into the victim to supply oxygen. The SAM 500P defibrillator provides the rescuer with real-time instructions regarding compressions with audible Good Compressions or Push Harder, Push Faster and Push Slower. These instructions also are displayed on the face of the device in order to ensure the rescuer performs the most effective CPR. Impedance Cardiogram (ICG) analysis is embedded in the software, which guides the user in the required force and speed of compressions for the victim. The ICG measures impedance changes in the chest cavity, which helps determine effective CPR. Because the ICG is related to how fast the compressions are applied, as well as how hard, the 500P can guide the user on both rate and depth.