Nichol G, Daya MR, Morrison LJ, et al. - Researchers examined if there is a significant correlation between chest compression depth and outcome based on accelerometer-recordings retrieved with monitor-defibrillators from a single manufacturer. In addition, they examined if an accelerometer-based analysis incorporated evidence-based practice guidelines on performance of CPR. A total of 5,434 adult patients treated were included. The adjusted odds ratios for survival to discharge were 1.15 for cases within 2005 depth range (38 mm to 51 mm), and 1.17 for cases within 2010 depth range (> 50 mm) compared with those with an average depth of < 38 mm. Overall findings suggest correlation of increased chest compression depth measured by accelerometer with better survival. It yields support for the likely correlation of current evidence-based recommendations to compress within 50 to 60 mm with greater survival than compressing to another depth.