In this large retrospective study of out-of-hospital cardiac arrests, researchers evaluated survival before and after the 2005 update to the American Heart Association (AHA) CPR guide. They found a 1.8 greater adjusted odds of survival after 2005. In a convenience sample of EKG strips, they also found improvements in CPR quality, including higher chest compression rates, higher proportion of time spent in chest compressions, and shorter chest compression pause times. Since the revision of the AHA guidelines, CPR quality and mortality have improved (abstract)
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