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AEDs arriving within 5-8 minutes would eliminate 2X deaths by sudden cardiac arrest.  added 02/10/02

Highlights from 
Effect of reducing ambulance response times on death from out of hospital cardiac arrest: cohort study.

From British Medical Journal June 9, 2001, which is on-line at http://bmj.com/cgi/content/full/322/7299/1385?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&titleabstract=ambulance+response+times&searchid=1013346582564_3117&stored_search=&FIRSTINDEX=0&fdate=1/1/2001

"Currently, the ambulance service has a statutatory obligation to arrive at the scene of 50% of emergency calls within 7 minutes and 90% within 14 minutes."  They are considering having alternative first responders, such as the fire service, which can get to a scene within 5 minutes 90% of the time.  This would increase the predicted survival rate to 10 or 11% from the current 6%. they note that" survival of out of hospital cardiac arrest in the United Kingdom is up to three times lower than that in some other countries"  they also state that "survival from cardiac arrest can be increased sixfold by providing first line responders with defibrillators."

They state that if an AED could arrive while a person is having chest pains, but before the onset of cardiac arrest that the survival rate would be 33%.

As is normal, they appear to ignore the approximate 40% of the sudden cardiac arrests which were not observed.

They make no estimate of the time lost between the cardiac arrest and when the emergency call was placed.

The following is Skyaid's estimate of survival rate.