34 Map 3 presents a simulated baseline scenario in which Seattle has no existing AEDs. The heat map shows the spatial concentration of cardiac arrest events, while the 217 dots represent the minimum number of AEDs required by the optimization model to achieve maximum coverage. These results indicate that a significantly larger number of AEDs would be needed to build an effective network from scratch. This scenario provides a benchmark for the infrastructure required without an existing AED network, highlighting the value of current coverage and the efficiency of strategic additions compared to building from scratch. Together, these maps demonstrate the value of a data-driven approach to public access defibrillation planning. By pairing CARES event data with NEAR AED locations, this modeling provides a data- driven foundation for assessing current coverage and identifying opportunities for strategic placement. The AED optimization model offers a practical tool for evaluating where additional AED placements could have the greatest impact under different planning scenarios. Collectively, these methods support more targeted planning and efficient resource allocation to improve OHCA outcomes across communities. Map 3. Optimized AED Placement Assuming No Existing AED Locations. As part of its broader modernization efforts and to strengthen collaboration across participating states, CARES transitioned to a regional management model in 2024. Rather than engaging states solely on an individual basis, CARES now takes a more integrated approach, bringing together neighboring states within defined regions to foster shared learning and collective progress. The CARES regions are outlined in Figure 1. Regional Collaboration Networks Figure 1. CARES Regional Map. Atlantic Northeast, Laney Whitney Pacific West, Jonathan Roberts Heartland, Chanarion Gardner Great Lakes-Mid Atlantic, Carisa Maloof Southern Plains, Taylor Neither Greater Southeast, Baylor Manley
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