摘要目的：探索最佳的胸外心脏按压频率及影响按压质量的因素，为保障高质量的心肺复苏（CPR）及相关培训提供依据与指导。方法对175名新护士进行为期3 d 的 CPR 理论及技能培训后，采用随机数字法分为5组，其中1个对照组，4个实验组。对照组为自由按压，在没有任何频率指引的情况下，在按压模型上实施2 min 的胸外按压，4个实验组分别在节拍器引导的100，110，120，140次／min 的频率下进行2 min 的胸外按压。结果100，110，120次／min 组的各项按压质量指标较对照组、140次／min组好，按压频率及按压者的体质量共可解释平均按压深度、足够深度按压次数占总按压次数比例、下压／上放时间之比、疲劳时间变异的13％，10％，11％，11％。结论100～120次／min 是实施 CPR 最佳的胸外按压频率；按压频率及按压者的体质量是影响按压质量的因素。

abstractsObjective To explore the optimum chest compression frequency and influencing factors of compression quality so as to provide reference and guidance for guaranteeing the high quality of CPR and related training.Methods A total of 1 75 new nurses attended a training on theory and skills of CPR for 3 days.And then,they were divided into 5 groups (1 control group +4 experimental groups)by random number method. Nurses in control group performed chest compression for 2 minutes without guidance for the frequency.In contrast,nurses in 4 experimental groups performed chest compression with the frequency of 1 00,1 1 0,1 20, 1 40 beats per minute (BPM)for 2 minutes guided by metronome.Results Compression quality indicators of 3 experimental groups (1 00,1 1 0,1 20 BPM)were better than that of control and 1 experimental groups (1 40 BPM).Compression frequency and weight of chest compression providers could collectively explain 1 3%, 1 0%,1 1 %,1 1 % of the variation in average compression depth,percentage of compression with sufficient depth,the ratio of time on compression and recoil,time to fatigue.Conclusions The optimum frequency is 1 00 -1 20 BPM.Compression frequency and weight of chest compression provider are influencing factors of compression quality.