For out-of-hospital cardiac arrest (OHCA) patients, every second is vital for their life. Shortening the prehospital time is a challenge\nto emergency medical service (EMS) experts. This study focuses on the on-scene time evaluation of the registered nurses (RNs)\nparticipating in already existing EMS teams, in order to explore their role and performance in different EMS cases. In total, 1247\ncases were separated into trauma and nontrauma cases. The nontrauma cases were subcategorized into OHCA (NT-O), critical\n(NT-C), and noncritical (NT-NC) cases, whereas the trauma cases were subcategorized into collar-and-spinal board fixation (TCS),\nfracture fixation (T-F), and general trauma (T-G) cases. The average on-scene time of RN-attended cases showed a decrease of\n21.05% in NT-O, 3.28% in NT-C, 0% in NT-NC, 18.44% in T-CS, 13.56% in T-F, and 3.46% in T-G compared to non-RN-attended.\nIn NT-O and T-CS cases, the RNs� attendance can notably save the on-scene time with a statistical significance (
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