Abstract 234: A Novel Form of Audiovisual Feedback can be Effectively Utilized to Achieve Specified Chest Compression Depth and Rate
Introduction: The importance of high quality chest compressions (CCs) for cardiac arrest patients is well established. Recent studies have demonstrated improved resuscitation success with CC depth exceeding 2 inches. At increased CC depths, it is desirable to decrease depth variability to minimize risk of CPR-related complications. A novel feedback display was developed to guide rescuers to achieve specific CC depth and rate. The purpose of this study was to test the effect of this new form of feedback on CC quality in a simulation setting.
Methods: Twenty-one BLS-certified emergency medical technicians (16 male, 25±4 yrs) performed two 4-minute intervals of continuous CCs on a manikin instrumented with an accelerometer for measurement of CC quality. In one trial, audiovisual feedback was disabled and in the other trial, rescuers received novel real-time audiovisual CC feedback featuring display of absolute CC rate and depth (E Series defibrillator, ZOLL Medical). Prior to the trial with feedback, participants received brief instruction on use of the audiovisual feedback prompts and briefly practiced CCs with the feedback activated. Rescuers were instructed to aim for CC depth of 2 in and rate of 100 CC/minute. Data were reviewed using Code Review software
Results: CC depth increased significantly with use of feedback (1.80±0.35 in vs. 2.12±0.25 in). The percentage of CCs with insufficient depth according to current guidelines (<1.5 in) was significantly reduced from 24±35% without feedback to 0±1% with feedback (p=0.006). Moreover, the percentage off CC with depth <2 in was also substantially reduced with use of feedback (p=0.002). Variability in CC depth decreased significantly with feedback (p=0.03). Rescuers generally performed CCs with excessive rate at baseline (125±20 CC/min) but improved with feedback (104±5, p<0.0001).
Conclusions: A new form of audiovisual feedback can be effectively utilized by rescuers to achieve specified chest compression depth and rate. Use of this form of feedback will allow rescuers to aim for a specific depth of compression in order to optimize patient outcome and potentially minimize CPR-related complications.
- © 2010 by American Heart Association, Inc.