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 100 m 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%.