Introduction: Mass casualty incidents pose a significant challenge to healthcare systems and emergency response services, as they involve a large number of casualties in a short time frame who must be rapidly assessed and prioritized for care. A key procedure in such situations is primary triage, which must be performed quickly, accurately, and in a coordinated manner. In Slovenia, the SIEVE triage algorithm is most commonly used. It enables fast and structured categorization of patients according to the severity of their condition. As professional firefighters are often among the first to arrive at the scene, they play a crucial role in the initial assessment and classification of casualties. In time-sensitive situations, their rapid and coordinated action significantly affects the course of the response. Cooperation between emergency services, especially between EMS teams and firefighters, is essential to ensure effective and safe management of casualties during a mass casualty incident. Purpose: The purpose of this thesis is to determine the level of knowledge about the implementation of primary triage in mass casualty incidents among healthcare workers in EMS and professional firefighters. Methods: A descriptive method and a quantitative cross-sectional research design were used. Data were collected through a structured questionnaire consisting of 20 simulated casualty scenarios. Respondents were asked to assign a triage category and select appropriate medical interventions according to the SIEVE algorithm. The survey was conducted via the 1KA online platform. Data analysis was performed using Excel and SPSS software. To compare the two groups, the T-test and Mann-Whitney U test were used, with statistical significance set at p < 0.05. Results: A total of 104 participants took part in the study (57 firefighters and 47 EMS healthcare workers). Professional firefighters achieved statistically better results in assigning triage categories using the SIEVE algorithm (92%) compared to healthcare workers (84%, p < 0.001). In the selection of appropriate medical interventions, the results were similar (firefighters 64.5%, healthcare workers 60%), with no statistically significant difference. The most common error was the selection of procedures that are not part of primary triage. Most respondents (92%) believe that more practical drills should be conducted to improve preparedness. Discussion and conclusion: Based on our research and a comparison with international literature, we found that properly trained professional firefighters can effectively perform primary triage using the SIEVE algorithm. Other studies have also shown that non-medical personnel, with appropriate training, can carry out triage efficiently, highlighting the importance of education and simulation. Our findings also revealed frequent selection of procedures not appropriate for primary triage. We confirmed that regular repetition of knowledge is essential, as the effectiveness of triage decreases significantly without continuous training, a point also supported by foreign studies. Overall, we conclude that systematic, structured, and regular training of all first responders – regardless of their professional background – has a major impact on triage performance in practice and can significantly improve response to mass casualty incidents.
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