Regional Variation in Out-of-Hospital Cardiac Arrest Incidence and Outcome

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Abstract
It remains to be determined how often out-of-hospital cardiac arrest (OHCA) occurs. Recent sources indicate that about 166 000 to 310 000 Americans per year experience an OHCA,1 although resuscitation is not attempted in many of these cases. The reported incidence of OHCA2 and reported survival to discharge after OHCA are highly variable.3