A Simple Audio-visual Prompt Device Can Improve CPR Performance

The Journal of Emergency Medicine, 05/24/2012

Kim SC et al. – A simple audio–visual prompt device can improve cardiopulmonary resuscitation (CPR) performance by emergency medical technicians.


  • From June 2008 to October 2008, 55 EMTs (39 men, mean age 34.9±4.8years) 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 100beats/min with a distinct 30th sound followed by two respiration sounds, each for 1second.
  • 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.


  • 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±3.9s, respectively, p<0.001; 95% CI 5.2–5.7 vs. 8.3–10.3s, 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±153.4mL, respectively, p<0.001; 95% CI 463.5–496.2 vs. 607.3–688.9mL, respectively).

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