While safety for responders in any medical emergencies always should be a top priority, it is perhaps even more important if the responders are volunteer lay-persons or off duty medical staff.
Every year, over 300,000 people suffer from out-of-hospital cardiac arrest (OHCA) in Europe. Only 8–10% survive.  Increasing survival in OHCA is actually not rocket science. Scientists and medical experts all agree that early cardiopulmonary resuscitation (CPR) and the use of an automated external defibrillator (AED) save lives and if used within the first 3–5 minutes survival could double!