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Map 1. Integrated View of Public OHCA Events and AED Locations.
This map overlays public OHCA events from CARES with AED locations from the NEAR AED Registry 
across Seattle. By combining these datasets, it shows where cardiac arrests occur relative to existing AED 
coverage, providing a clearer understanding of alignment and gaps. This integrated view supports more 
informed planning, prioritization, and decision-making to improve timely defibrillation and outcomes.
Map 2 presents an AED deployment 
scenario that explicitly accounts 
for the existing NEAR AED network 
in Seattle. The heat map displays 
the spatial concentration of cardiac 
arrest events, the blue dots represent 
current AED locations, and the 
50 green dots indicate additional 
AED sites recommended by the 
optimization model to maximize 
coverage. The results suggest that, 
while the current AED network 
provides a meaningful foundation, 
important coverage gaps remain in 
several higher-need areas. 
By strategically adding a limited 
number of new AEDs, this scenario 
demonstrates how data-driven 
optimization can strengthen the 
current network in a targeted and 
efficient way. This is especially 
useful for policymakers and public 
health planners because it supports 
incremental, evidence-based 
expansion rather than requiring a complete 
redesign of the existing system.
Map 2. Optimized AED Placement with Existing NEAR AED Locations.
* Synthetic dataset was utilized

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