Limitation
OHCA, cardiac arrest
CARDIAC ARREST
The foremost limitation results from the chosen study design, which is a non-randomized simulation trial. The present study was part of a large feasibility study. Due to this, randomisation was not possible. The study design as a non-randomised trial study is a limitation. We have to assume that mainly participants with primary interest in the topic came forward. Since participants were aware, that they would encounter a simulated cardiac arrest, an expectation bias with a potential positive effect on the execution quality must be considered. Participants were less surprised and most likely had lower stress levels. Due to study design the dispatcher knew, that the caller would describe a person in OHCA, which reduced the time until recognition of OHCA. Therefore, sensitivity and specificity of the algorithm regarding cardiac arrest recognition were not evaluated. Increasing the accuracy of OHCA recognition is a topic of ongoing research [