This prospective three-arm randomized trial compared travel-time-based smart alerting with 600 m and 2500 m fixed-radius alerts for community responders to out-of-hospital cardiac arrest. Across 823 activations, responders arrived before EMS in 31%, 57%, and 58% of missions with 600 m, 2500 m, and smart alerting, respectively. Smart alerting improved arrival before EMS versus 600 m alerts (risk difference +26.8%, 95% CI 18.6–34.4), but showed no significant difference versus 2500 m alerts (+1.2%, 95% CI −7.0 to +9.3). The authors called for further research into patient outcomes.
Smart alerting improved responder arrival before EMS compared with a 600 m radius, but superiority over a 2500 m radius was not demonstrated. Whether this improves patient outcomes remains unresolved.
Study limitation: The primary endpoint was responder arrival before EMS, not a patient-centred outcome; the abstract does not report survival or neurological outcomes.
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