Abstract 78: Multi-Criteria Evaluations for Improved Placement of Defibrillators: Preliminary Results
Introduction: When a person suffers an out of hospital cardiac arrest (OHCA), help within the first 3-5 minutes is critical for survival. In many cases, ambulances do not arrive within these critical minutes. Past studies show that early use of an Automatic External Defibrillator (AED) can improve the survival rate from 10% to 50%. Therefore Swedish Resuscitation Council has recommended placement of AEDs in public places so that the general public can assist when an OHCA is taking place. However, the defibrillators in Stockholm as well as in most parts of Sweden are financed and placed by individuals, companies or organizations at their own initiative. Where are the defibrillators most needed? Is the current placement of defibrillators suitable? These are the research issues for this study.
Hypothesis: Can Multi-Criteria Evaluations (MCE) be used to determine the most suitable placements of AED based on historical data for OHCA and analysis of risk groups?
Method: Census data on nighttime population (age and gender) over Stockholm in 250 m by 250 m grid were collected from Statistics Sweden. Data on previous OHCA in Stockholm during 2006-2012 were provided by the cardiology center of Södersjukhuset. Prior heart disease information was extracted from the Swedish OHCA database. MCE, a spatial analysis tool in GIS for decision support, were performed to determine the most suitable locations for placing defibrillators based on four different scenarios with different weights of the risk factors.
Results: Preliminary results show that a number of areas in Stockholm are in need of more strategic placement of AEDs. The most suitable locations complement the existing defibrillators are presented in the first three scenarios. In scenario four, only based on the historical OHCA occurrences, the placements somewhat overlap with the existing defibrillators plus the need of additional AEDs in several areas. These results indicate that MCE is a promising tool to support decision-making on the placement of AEDs. Future research is planned to take into account more risk factors and to improve the data availability and quality.
- © 2013 by American Heart Association, Inc.