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Dragon5560
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It all depends of your location and Hospital SOP/Protocols. NYS Out of Hospital SCA survival rate is around 5% and that is mainly due to not enough people/bystanders either knowing how to do CPR or not willing to get involved. Coupled with the fact that the second step in the chain of survival is Early Defibrillation, there are not enough P.A.D. available. We have a very large concentrated population in NYC which lends itself to extended response times, through dense traffic, multiple one way streets, a pedestrian population that does not yield to emergency vehicles, as well as multi level dwellings which either have walk up stairs or congested and barely working elevators. Now, in suburbia it is different, and we also have rural emergency response areas which make call to contact times extended as well as transport times.Actually, the people who do CPR the most are the ED techs.
It's been my experience that untrained bystander CPR is every bit as effective as CPR performed by someone who did a class. The mortality rate for out of hospital arrests is about 90%. For in-hospital arrests, it's about 75%.
Those are not great numbers, unless you bear in mind that the mortality rate without intervention is 100%.