This retrospective study included 107 consecutive out-of-hospital cardiac arrest cases in Valais, Switzerland, from January 2021 through December 2023. Public responders arrived first in 68% of cases and had a shorter emergency-call-to-arrival interval than EMS (p = 0.019). Survival on hospital arrival was 19% in the public responder group versus 24% in the EMS group; survival to discharge was 9.6% versus 15%, respectively, with neither difference statistically significant. The FRED-PA1 AED rhythm recognition algorithm was judged effective and consistent with current recommendations.
Public responders frequently arrived before EMS, but this study did not establish a survival advantage. The non-significant survival comparisons should not be interpreted as equivalence.
Study limitation: The small retrospective cohort limits causal inference and precision of survival comparisons; the abstract provides no confidence intervals or adjusted estimates.
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