The aim of this study is estimation of the survival rate afterout-of-hospital cardiac arrests (CA) and identifies factorsconcerned with efficacy of cardiopulmonary resuscitation(CPR). It contained all interventions from Krakow’sEmergency Medicine Service in 2004 (66 557) and analyzedcases where resuscitation had been attempted (329). We didresearches about thirty parameters but only nine of themwere statistically significant (P<0.05). Return ofspontaneous circulation was achieved in 163 patients(49,5%) and 62 patients were alive one month after CA(18,8%). Higher survival rate was associated with shorterarrival time, age of patient, location of collapse, witnessedCA, bystander CPR, ventricular fibrillation (VF),defibrillation performed by rescue team, patient condition inEmergency Unit. Results confirmed that crucial point insurvival chain is immediately activation of EMS system, bystander CPR (to keep VF) and short time to first shock. These elements depend mostly on witnesses therefore we should focus on community education in BLS and develop Public Access Defibrillation Programs (PAD). In Poland obligatory education in first aid at primary school and gymnasium was established in 2009. Program PAD has worked in Krakow since 2008. Our research supports the efficacy of these programs and provides insight for future efforts.