The aim of this study is to report on out-of-hospital resuscitation of cardiac arrest patients along with relevant literature cardiopulmonary resuscitation (CPR) is technology for resuscitating patients by maintaining the oxygen supply to organs in order to preventing progression from clinical death to biological death and recovering the heart beat and circulation, through the circulatory support of mechanical ventilation. Not every cardiac arrest patient can be revived even with the proper implementation of CPR techniques. Patient’s survival rate is decided by how quickly and correctly CPR is executed. A patient, who wasn’t witnessed going into cardiac arrest on site, had a 5-cycle CPR performed for 2 minutes before being transferred to a hospital, where an automated external defibrillator (AED) was used. For a patient, who is witnessed going into cardiac arrest, it is recommended that an AED be used immediately followed by advanced cardiac life support (ACLS). In the out-of-hospital scenario, it is rare that a patient experiences return of spontaneous circulation (ROSC) when being transferred by 119 Emergency Medical Service and in a case of executing ACLS. Cardiac arrest was witnessed on site and CPR was executed. First-aid staff executed high quality CPR after arriving which led to ROSC on site. However, the patient was diagnosed for dementia. This is a case of a patient surviving cardiac arrest by being ROSC on site and eventually leaving the hospital.