title: A simple audio-visual prompt device can improve CPR performance.
abstract: BACKGROUND
  An adjunct to assist cardiopulmonary resuscitation (CPR) might improve the quality of CPR performance.
  
  
  OBJECTIVE
  This study was conducted to evaluate whether a simple audio-visual prompt device improves CPR performance by emergency medical technicians (EMTs).
  
  
  METHODS
  From June 2008 to October 2008, 55 EMTs (39 men, mean age 34.9±4.8 years) participated in this study. A simple audio-visual prompt device was developed. The device generates continuous metronomic sounds for chest compression at a rate of 100 beats/min with a distinct 30(th) sound followed by two respiration sounds, each for 1 second. All EMTs were asked to perform a 2-min CPR series on a manikin without the device, and one 2-min CPR series with the device.
  
  
  RESULTS
  The average rate of chest compressions was more accurate when the device was used than when the device was not used (101.4±12.7 vs. 109.0±17.4/min, respectively, p=0.012; 95% confidence interval [CI] 97.2-103.8 vs. 104.5-113.5/min, respectively), and hands-off time during CPR was shorter when the device was used than when the device was not used (5.4±0.9 vs. 9.2±3.9 s, respectively, p<0.001; 95% CI 5.2-5.7 vs. 8.3-10.3 s, respectively). The mean tidal volume during CPR with the device was lower than without the device, resulting in the prevention of hyperventilation (477.6±60.0 vs. 636.6±153.4 mL, respectively, p<0.001; 95% CI 463.5-496.2 vs. 607.3-688.9 mL, respectively).
  
  
  CONCLUSIONS
  A simple audio-visual prompt device can improve CPR performance by emergency medical technicians.
authors.affiliation: Department of Emergency Medicine, Konkuk University School of Medicine, Konkuk University Chungju Hospital, Chungju, Korea.
authors.forename: Sang Chul
authors.initials: SC
authors.lastname: Kim
authors.forename: Sung Oh
authors.initials: SO
authors.lastname: Hwang
authors.forename: Kyung Chul
authors.initials: KC
authors.lastname: Cha
authors.forename: Kang Hyun
authors.initials: KH
authors.lastname: Lee
authors.forename: Hyun
authors.initials: H
authors.lastname: Kim
authors.forename: Yun Kwon
authors.initials: YK
authors.lastname: Kim
authors.forename: Ho Sung
authors.initials: HS
authors.lastname: Jung
authors.forename: Kyeong Ryong
authors.initials: KR
authors.lastname: Lee
authors.forename: Kwang Je
authors.initials: KJ
authors.lastname: Baek
mesh_terms: D000328:Adult; D001296:Audiovisual Aids; D016887:Cardiopulmonary Resuscitation / Q000295:instrumentation* / Q000592:standards; D004632:Emergency Medical Services / Q000592:standards*; D006323:Heart Arrest / Q000628:therapy*; D006801:Humans; D008297:Male; D008348:Manikins