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Researchers plot locations where AEDs could save more lives
Date:5/2/2013

nly 17 per cent those outside of downtown.

Professor Chan then looked at the 1,006 cardiac arrests that did not take place near an AED. He said that be placing AEDs in the top 30 cardiac arrest "hot spots," they could have covered an additional 112 historical arrests, or 32 per cent. The average distance between a cardiac arrest and an AED would fall to 262 metres from 281 meters.

"Reducing the distance a bystander needs to travel by 20 metres or up to 40 meters in a roundtrip has the potential to save close to half a minute in response time," said Dr. Morrison, an emergency medicine specialist.

"If you have a cardiac arrest, every second counts. Out-of-hospital cardiac arrest kills an estimated 300,000 people in North America annually," she said. "Only five per cent of people who suffer out-of-hospital cardiac arrest survive to be discharged from hospital. The probability of survival decreases up to 10 per cent with each minute of delay between collapse and treatment."

Dr. Morrison heads Rescu, the largest research team of its kind in Canada dedicated to improving out-of-hospital resuscitation.

Professor Chan said his mathematical model is more accurate than a population-based model, in which AEDs are placed in areas of densest daytime population.

"Our optimization model should be viewed as a decision-support tool to help prioritize placement of AEDs, make efficient yse of public, donor or private funds directed toward public access defibrillator programs, and potentially maximize survival on the basis of geographic patterns of cardiac arrest," said Professor Chan. "Because AEDs are expensive and cannot be placed everywhere, our model allows a decision-maker to quantify the trade-off between the number of AEDS deployed and coverage."

While it was not part of the research paper, Professor Chan used his mathematical model to indicate the top 10 cardiac hot spots in Toronto not currently covered by AEDs:

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Contact: Leslie Shepherd
shepherdl@smh.ca
416-864-6094
St. Michael's Hospital
Source:Eurekalert

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