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Does training on placing rescuer's hands on victim's chest have an impact on the depth and frequency of chest compressions?

机译：将救护者的手放在受害者胸部上的培训是否会对胸部按压的深度和频率产生影响？

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Dear Sir During five Basic Life Support — Automatic External Defibrillator (BLS - AED) seminars a survey comprising 102 persons over the impact of rescuers' hands placement on the quality of chest compressions was organized. Participants were asked to perform four cycles of cardio-pulmonary resuscitation (CPR) on a manikin in two different scenarios. First, participants were asked to perform CPR in a typical manner. Second, CPR was performed with a mark indicating rescuers' proper hands position. Timing for two scenarios were 60±7s (43-83s) and 60 ±5.75 seconds (47-81 s). In both scenarios 61% exceeded 1 min. Concerning quality of the compressions, at first scenario 88% achieved adequate compression depth while at the second 100%. Existence of the indication mark is correlated with better performance (r= 0.591, p< 0.01). Existence of the indicator did not change mean time but reduced standard deviation and increased participants' achievement of adequate depth. Further data analysis revealed negative correlation of female sex with adequate depth (r= —0.306, p < 0.01). Older age is correlated with longer timing (r= 0.196, p<0.05) and adequate depth achievements (r= 0.216, p < 0.05). Previous attendance is correlated with worse timing performance (p=0.04) but also adequate depth achievement (r= 0.287, p < 0.01). Hand position during CRP is an issue concerning a variety of studies. ERC guidelines recommend as appropriate the lower half on the sternum (Koster et al. 2010) alongside with teaching in a simplified manner. This is reasonable since more complex guidelines, such as the ones of 2000 could potentially lead to bad positioning as shown by Owen et al. (2011) in a study comparing 2000 and 2005 guidelines.
机译：尊敬的先生：在五项基本生命支持-自动体外除颤器（BLS-AED）研讨会上，组织了一项由102人组成的调查，调查涉及施救者双手放置对胸部按压质量的影响。要求参与者在两种不同的情况下对人体模型执行四个心肺复苏（CPR）周期。首先，要求参与者以典型方式进行心肺复苏术。其次，进行心肺复苏术时要有一个标明救助者正确手部位置的标记。两种情况下的计时分别为60±7s（43-83s）和60±5.75秒（47-81 s）。在这两种情况下，超过1分钟的人数占61％。关于压缩质量，在第一种情况下88％达到了足够的压缩深度，而在第二种情况下达到了100％。指示标记的存在与更好的性能相关（r = 0.591，p <0.01）。指标的存在不会改变平均时间，但会减少标准差并增加参与者获得足够深度的机会。进一步的数据分析显示，具有足够深度的女性性别呈负相关（r = -0.306，p <0.01）。年龄越大，时间越长（r = 0.196，p <0.05）和足够的深度成就（r = 0.216，p <0.05）相关。以前的出席与较差的计时性能（p = 0.04）相关，但也与足够的深度成就（r = 0.287，p <0.01）相关。 CRP期间的手部位置是涉及各种研究的问题。 ERC指南适当建议在胸骨的下半部分（Koster等，2010）以及简化的教学方法。这是合理的，因为Owen等人指出，更复杂的准则（例如2000准则）可能会导致定位错误。 （2011）在一项比较2000年和2005年指南的研究中。

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