Longitudinal exploration of in situ mock code events and the performance of cardiac arrest skills.

Introduction: In hospital cardiac arrest (IHCA) affects 200,000 adults in the United States each year, and resuscitative efforts are often suboptimal. The objective of this study was to determine whether a program of "mock codes" improves group-level performance of IHCA skills. Our primary outcome of interest was change in CPR fraction, and the secondary outcomes of interest were time to first dose of epinephrine and time to first defibrillation.