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Reducing ambulance response times to 5 minutes would double the
survival rate for cardiac arrest not witnessed by ambulance crews.
Currently the ambulance service is statutorily obliged to arrive at the
scene of 50% of emergency calls within 7 minutes and 90% of calls
within 14 minutes but only 6% of patients with cardiac arrest survive.
In their model based on survival from cardiac arrest and response times
in Scotland between 1991 and 1998, Pell et al (p 1385) show that
reducing response times to 8 and 5 minutes would have increased
survival to 8% and 11% respectively.