Department of Emergency Medicine, CHA University School of Medicine, Seongnam-Si, Gyeonggi-Do, Republic of Korea.
Emerg Med J. 2013 Jul;30(7):551-4. doi: 10.1136/emermed-2012-201534. Epub 2012 Jul 25.
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.
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.
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).
Induction of a shorter compression phase is correlated with a deeper chest compression during metronome-guided cardiopulmonary resuscitation.
最近的研究表明，按压周期与与胸外按压质量相关的其他因素之间可能存在相互作用。按压周期代表按压阶段的分数。我们旨在研究在节拍器指导的心肺复苏过程中，更短的按压周期对平均胸外按压深度的影响。
高级医学生在指导声音的引导下进行了 12 组胸外按压，有三种下压模式（正常、快速和非常快速）和四种频率（80、100、120 和 140 次/分钟），以随机顺序进行。采用重复测量方差分析比较试验中平均胸外按压深度和按压周期。
随着下压模式从正常变为非常快速，平均胸外按压深度呈线性增加，按压周期呈线性下降（两者均 p<0.001）。仅在正常下压模式下，随着胸外按压频率的增加，平均胸外按压深度呈线性增加（p=0.004）。
在节拍器指导的心肺复苏过程中，诱导更短的按压周期与更深的胸外按压相关。
