News Item – One-in-Five Cardiac Arrests Occur Near Inaccessible Defibrillators Interview with: Timothy C. Y. Chan, PhD What should readers take away from your report?

Response: Temporal availability is a critical factor to consider in both the evaluation of current AED programs as well as the decision on where to locate AEDs. Of all cardiac arrests occurring within 100 m of an existing AED, about one in five cardiac arrests that occur are near an inaccessible AED. We found that our AED placement optimization model provided the largest improvement during the night, which was precisely when the largest loss in coverage due to limited temporal accessibility was experienced, as well as when survival was lowest. Mathematical optimization approaches can useful in as an assistive tool to help determine public AED locations.

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