Sudden cardiac arrest is one of the leading causes of death in the world. When it occurs outside hospital setting, it is necessary to start implementing basic life support measures as soon as possible with cardiopulmonary reanimation using an automatic external defibrillator. Prompt and effective intervention by the civilians is crucial for the very outcome of cardiac arrest outside of hospital. The aim of the research is to raise awareness of the importance of early reanimation and defibrillation in cases of sudden cardiac arrest, application and location of an automatic external defibrillator. Encourage and make civilians aware of their important role in responding in a timely manner and providing first aid to a vulnerable person. We conducted a cross-sectional study involving 248 respondents who do not have a medical level of education. For the purposes of the research, data were collected using an anonymous survey questionnaire through the use of Google Forms. Informants were accessed through social media networks. The results of the research showed that 86.3% of the total number of informants have attended first aid course. Only 28.2% of informants stated that they felt safe enough to start resuscitation of a person showing a symptom of cardiac arrest, and 63.3% stated that applied resuscitation measures to people who had experienced sudden cardiac arrest. Significant information that needs to be emphasized refers to the question of the use of an automatic external defibrillator, to which 27% of informants stated that the device was used, and 23.8% stated that they do not know what an automatic external defibrillator is, despite the fact that almost 9/10 of informants attended first aid. The results of the study showed that informants did not differ statistically significantly in the results on the knowledge scale with respect to whether they attended a first aid course, gender and the knowledge level. A small, statistically significant correlation between acquisition and knowledge was found, where the results show that older people achieve lower results on the knowledge scales (p = 0.014). A large number of civilian informants, who do not have a medical level of education, despite the fact that there is a level of awareness of the importance of early reanimation and defibrillation, do not show the necessary and satisfactory knowledge in basic life support procedures.