Abstract 217: Quality of CPR Performed on a Mattress Can Be Improved with a Novel CPR Feedback Device

Abstract

Accelerometer-based CPR feedback devices estimate sensor movement, but cannot distinguish between compression of the chest and deflection of the underlying surface (e.g. mattress). This study aims to compare CPR quality improvement provided by feedback from an accelerometer-based device and a novel device. The novel device provides visual feedback on compression depth, based on measured changes in magnetic field strength between a backpad and a chestpad, and gives audible and visual rate guidance. Methods: Critical care nurses performed 2 sets of continuous chest compressions on a weighted manikin placed on a backboard on a common foam mattress and hospital bed. For “baseline”, participants did 120s of CPR with no training or feedback. After 10 minutes for rest and training on use of device feedback to do Guidelines 2010 CPR, they did 120s of compressions with feedback from the novel (MAG) or the accelerometer-based (ACC) device, as randomized. Manikin data on chest compressions were captured and analyzed (PC Skillreporting System, Laerdal). Results: Weight and height (73 ± 1 kg, 164 ± 6 cm, mean ± SD) of the 22 nurses (1 male) did not differ significantly between groups. For all nurses, baseline chest compression depth was 37.3 ± 9 mm and rate was 101 ± 17 min -1 . Manikin-recorded compression depth was significantly higher in the MAG (n=11, 49.0 ± 9 mm) than the ACC group (n=11, 39.3 ± 7 mm), p=0.009. The ACC device-estimated depth (52.9 ± 8 mm) guided the feedback resulting in actual depth of 39.3 ± 7 mm. Compared to baseline, the depth was significantly higher with MAG (95% CI: [2.5, 17.3]) but not with ACC feedback (95% CI: [-3.9, 11.3]). There was a difference in compression rate (94 ± 9 vs 107 ± 10 min -1 , p=0.005), but not duty cycle (42 ± 4 vs 44 ± 4 %, p=0.3) for MAG vs ACC. Conclusion: In a realistic simulation on a hospital bed, use of a novel CPR feedback technology (MAG) by nurses significantly improved their chest compression depth compared to no feedback or to accelerometer-based feedback.