From 1994 to 2011, there were 1864 cardiac arrests in public locations. Of these cardiac arrests, 62% occurred on weekends, in the evening, or during the night.
Regardless of the accessibility of AEDs, nearly 30% of all cardiac arrests occurred within 100 m of a public defibrillator. Similarly, 30.5% of cardiac arrests during workday hours occurred within 100 m of an AED, as did 27.8% of all cardiac arrests occurring in the evening, during the night, and on weekends. “Thus, assuming all AEDs were accessible 24 hours per day, seven days a week, nearly 30% of all cardiac arrests in public locations could be reached by an AED within a few minutes on weekdays and weekends,” report the investigators.
However, of the 537 cardiac arrests that occurred within 100m of an AED, there was no access to the device in 180 cases. During workday hours, the limited accessibility to the AEDs decreased coverage of the cardiac arrests by 4.1%. During the evening, night-time, and weekend hours, limited accessibility to the devices reduced coverage of the cardiac arrests by 53.4%.