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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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