“If your heart stops at a school, you’re much more likely to be near an AED,” said lead study author Steven Brooks, MD, MSc, of Queen’s University in Kingston, Canada. “The problem is that many building types – like shopping malls, hotels and race tracks – that are higher risk for cardiac arrest are poorly covered by registered AEDs. Getting bystanders to actually use the AEDs is another hurdle, but they can’t use them if they aren’t there to begin with.”