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Emerg Med J 30:551-554 doi:10.1136/emermed-2012-201534
  • Original article

Induction of a shorter compression phase is correlated with a deeper chest compression during metronome-guided cardiopulmonary resuscitation: a manikin study

  1. Ok Jun Kim1
  1. 1Department of Emergency Medicine, CHA University School of Medicine, Seongnam-Si, Gyeonggi-Do, Republic of Korea
  2. 2Division of Cardiology, Department of Internal Medicine, CHA University School of Medicine, Seongnam-Si, Gyeonggi-Do, Republic of Korea
  3. 3Department of Emergency Medicine, Yonsei University College of Medicine, Seodaemun-Gu, Seoul, Republic of Korea
  1. Correspondence to Dr Tae Nyoung Chung, 59 Yatap-Ro, Seongnam-Si, Gyeonggi-Do 463-712, Republic of Korea; hendrix74{at}gmail.com
  1. Contributors All seven authors have made substantial contributions to all of the following: the conception and design of the study, or acquisition of data, or analysis and interpretation of data; drafting the article or revising it critically for important intellectual content; final approval of the version to be submitted. In detail: TNC, conception, design, analysis and interpretation of data, drafting of the manuscript, final approval given; JB, acquisition of data, analysis and interpretation of data, final approval given; ECK, acquisition of data, critical revision of manuscript, final approval given; YKC, critical revision of manuscript, final approval given; JSY, critical revision of manuscript, final approval given; SWC, critical revision of manuscript, final approval given; OJK, critical revision of manuscript, final approval given.

  • Accepted 26 June 2012
  • Published Online First 25 July 2012

Abstract

Objectives Recent studies have shown that there may be an interaction between duty cycle and other factors related to the quality of chest compression. Duty cycle represents the fraction of compression phase. We aimed to investigate the effect of shorter compression phase on average chest compression depth during metronome-guided cardiopulmonary resuscitation.

Methods Senior medical students performed 12 sets of chest compressions following the guiding sounds, with three down-stroke patterns (normal, fast and very fast) and four rates (80, 100, 120 and 140 compressions/min) in random sequence. Repeated-measures analysis of variance was used to compare the average chest compression depth and duty cycle among the trials.

Results The average chest compression depth increased and the duty cycle decreased in a linear fashion as the down-stroke pattern shifted from normal to very fast (p<0.001 for both). Linear increase of average chest compression depth following the increase of the rate of chest compression was observed only with normal down-stroke pattern (p=0.004).

Conclusions Induction of a shorter compression phase is correlated with a deeper chest compression during metronome-guided cardiopulmonary resuscitation.

Footnotes

  • Competing interests None.

  • Ethics approval Ethics approval was provided by the Institutional Review Board of CHA Bundang Medical Center, CHA University, Seongnam-Si, Gyeonggi-Do, Republic of Korea.

  • Provenance and peer review Not commissioned; externally peer reviewed.


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