The HeartSine samaritan® PAD 500P provides all the advantages of the 300P with the addition of an innovative CPR advisor. Regardless of whether it is a lay person or a professional rescuer, the AHA/ERC guidelines place a greater emphasis on the importance of CPR and advocate the prompt initiation of effective bystander CPR to significantly reduce mortality due to out-of-hospital Cardiac Arrest (CA). HeartSine can now provide a device to support these guidelines by the introduction of the HeartSine samaritan PAD 500P with CPR Advisor.