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Starting in 2010, American Heart Association guidelines increased the recommended chest compression depth to at least 51 mm (2 inches). Using real-time audiovisual feedback, researchers prospectively analyzed chest compression depth and outcomes in 593 consecutive adults with out-of-hospital cardiac arrest of presumed cardiac etiology in two emergency medical services systems in Arizona from 2008 to 2011.
Twenty-three percent of patients had return of spontaneous circulation, 11% survived to hospital discharge, and 8% had favorable neurological outcomes (defined as Cerebral Performance Category Scores of 1 or 2) at hospital discharge. Survivors were more likely to have witnessed arrests, initial shockable rhythms, or hypothermia treatment.
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