1 Department of Health Science and Technology, The Faculty of Medicine, Aalborg University, VBN2 Public Health and Epidemiology Group, The Faculty of Medicine, Aalborg University, VBN3 The Faculty of Medicine, Aalborg University, VBN4 Aalborg University Hospital, The Faculty of Medicine, Aalborg University, VBN5 Klinik Hjerte-Lunge, The Faculty of Medicine, Aalborg University, VBN6 Hjertemedicin (Kardiologi), The Faculty of Medicine, Aalborg University, VBN7 unknown8 The Faculty of Engineering and Science, Aalborg University, VBN
BACKGROUND: Although increased dissemination of automated external defibrillators (AEDs) has been associated with more frequent AED use, the trade-off between the number of deployed AEDs and coverage of cardiac arrests remains unclear. We investigated how volunteer-based AED dissemination affected public cardiac arrest coverage in high- and low-risk areas. METHODS AND RESULTS: All public cardiac arrests (1994-2011) and all registered AEDs (2007-2011) in Copenhagen, Denmark, were identified and geocoded. AED coverage of cardiac arrests was defined as historical arrests ≤100 m from an AED. High-risk areas were defined as those with ≥1 arrest every 2 years and accounted for 1.0% of the total city area. Of 1864 cardiac arrests, 18.0% (n=335) occurred in high-risk areas throughout the study period. From 2007 to 2011, the number of AEDs and the corresponding coverage of cardiac arrests increased from 36 to 552 and from 2.7% to 32.6%, respectively. The corresponding increase for high-risk areas was from 1 to 30 AEDs and coverage from 5.7% to 51.3%, respectively. Since the establishment of the AED network (2007-2011), few arrests (n=55) have occurred ≤100 m from an AED with only 14.5% (n=8) being defibrillated before the arrival of emergency medical services. CONCLUSIONS: Despite the lack of a coordinated public access defibrillation program, the number of AEDs increased 15-fold with a corresponding increase in cardiac arrest coverage from 2.7% to 32.6% over a 5-year period. The highest increase in coverage was observed in high-risk areas (from 5.7% to 51.3%). AED networks can be used as useful tools to optimize AED placement in community settings.
Circulation (baltimore), 2014, Vol 130, Issue 21, p. 1859-1867
Adult; Aged; Aged, 80 and over; Cohort Studies; Community Networks; Defibrillators; Denmark; Electric Countershock; Emergency Medical Services; Female; Humans; Male; Middle Aged; Out-of-Hospital Cardiac Arrest; Prospective Studies; Retrospective Studies; Time Factors; Volunteers