Heartsine® samaritan® PAD 500P semi-automatic defibrillator The HeartSine® samaritan® PAD 500P defibrillator has the integrated CPR Advisor™ giving rescuers feedback on the effectiveness of their CPR efforts in real time, such as “Good compressions” or “Push harder”, “Push faster” or “Push slower”. These instructions also are displayed on the face of the device and can be understood and easily used by anyone from bystander to trained first aider.