Abstract 103: Analysis of Out-of-Hospital Cardiac Arrest Location and Public Access Defibrillator Placement in Metro Phoenix, Arizona
Background and Objective: Automated external defibrillators (AEDs) improve outcomes from out-of-hospital cardiac arrest (OHCA) but are infrequently used. We sought to compare the locations of OHCAs and AEDs in Metro Phoenix, Arizona.
Methods: We used a statewide OHCA registry including AED locations (1/2010-12/2011) in Metro Phoenix, Arizona (population=3.9 million). Public location OHCAs and AEDs were geocoded using ArcGIS 10.1 (Esri, Redlands, CA) with hot spots of OHCAs using Kernel density estimation and overlapped the number of AED locations. We performed Spearman rank correlation test to determine if there was a correlation between OHCA incidents and number of AEDs. Additionally, we classified OHCA incidents and AEDs according to location.
Results: From 4508 adult OHCAs, 4030 cases (89.4%) could be geocoded. Of them, 1255 cases occurred in public places. After excluding events occurring in healthcare facilities, traumatic arrests, and arrests occurring after EMS arrival, there were 615 OHCA cases. Of these, 496 cases occurred in the Metro Phoenix area (study group). Of 2461 AEDs in the registry, 2341 (95.1%) could be geocoded and 1682 AEDs in the Metro Phoenix area were included in the analysis. Shown is the comparison of OHCA incidents and number of AEDs per ZIP code tabulation area (ZCTA) (figure). Event/AED correlation analysis showed weak correlation (r=0.274; p=0.002). Events occurred most frequently “in cars/roads/parking lots” (111/428, 25.9%), but there was no identified AEDs for these areas. AEDs (541/1655, 32.7%) were most frequently placed at schools, yet only 5 OHCAs occurred during 2 years in schools.
Conclusion: Using GIS technology, it was possible to identify the areas where OHCAs occurred most frequently but AEDs were lacking. There was weak correlation between OHCA events and deployed AEDs in Metro Phoenix, Arizona. Having event and AED location data and performing this analysis is important to assure optimal utilization of AEDs.
- © 2013 by American Heart Association, Inc.