Takahashi Haruka, Suzuki Kensuke, Okada Yohei, Harada Satoshi, Yokota Hiroyuki, Ong Marcus Eng Hock, Ogawa Satoo
The Graduate School of Medical & Health Science, Nippon Sport Science University, Japan.
Health Services and System Research, Duke-NUS Medical School, National University of Singapore, Singapore.
Resusc Plus. 2024 Oct 30;20:100818. doi: 10.1016/j.resplu.2024.100818. eCollection 2024 Dec.
This study aimed to investigate the physiological load on bystanders during cardiopulmonary resuscitation (CPR) and the quality of chest compressions in hot and humid environments.
This prospective experimental study compared the physical load and quality of chest compressions among healthy volunteers who performed 10 min chest compression in a climate chamber under normal conditions (for Tokyo) (Wet Bulb Globe Temperature [WBGT] 21 °C) and hot and humid conditions (WBGT 31 °C). The primary outcome was the depth of chest compressions over a 10-minute period. Secondary outcomes included the volunteer's heart rate (HR), core body temperature (BT), Borg scale for assessing fatigue, and blood lactate levels. Data were analyzed using two-way repeated measures analysis of variance (ANOVA) and paired t-tests.
Out of 31 participants, 29 participants (mean [SD] age: 21[0.7], male: 21 [70.5 %]) were included in the analysis. For WBGT 21 °C and 31 °C, the mean chest compression depth at 10 min was not statistically difference (the depth of chest compression: 52.2 mm and 51.5 mm (p = 0.52)). At 10 min, heart rate and core temperature were 126 vs. 143 bpm, and 37.4℃ vs. 37.5℃ for WBGT 21℃ vs. WBGT 31℃ (mean differences: 17 bpm [95 % CI: 7.7-26.3], 0.1℃ [95 % CI: -0.1-0.3]). At the end, Borg scale was 16 vs. 18 and lactate levels were 3.9 vs. 5.1 mmol/L (mean differences: 2 [95 % CI: 1-3], 1.2 mmol/L [95 % CI: 0.1-2.3]).
there was no significant difference in the depth of chest compression of paramedic students under the conditions between WBGT 31℃ and WBGT 21℃. For secondary outcomes, the lactate and fatigue of bystanders increased under WBGT 31℃ compared to WBGT 21℃. Further research is needed on CPR in hot and humid environments.
本研究旨在调查心肺复苏（CPR）过程中旁观者的生理负荷以及在炎热潮湿环境下的胸外按压质量。
这项前瞻性实验研究比较了健康志愿者在正常条件下（东京）（湿球黑球温度[WBGT]21°C）和炎热潮湿条件下（WBGT 31°C）在气候舱内进行10分钟胸外按压时的身体负荷和胸外按压质量。主要结局是10分钟内胸外按压的深度。次要结局包括志愿者的心率（HR）、核心体温（BT）、用于评估疲劳的博格量表以及血乳酸水平。数据采用双向重复测量方差分析（ANOVA）和配对t检验进行分析。
31名参与者中，29名参与者（平均[标准差]年龄：21[0.7]岁，男性：21名[占70.5%]）纳入分析。对于WBGT 21°C和31°C，10分钟时的平均胸外按压深度无统计学差异（胸外按压深度：52.2毫米和51.5毫米（p = 0.52））。10分钟时，WBGT 21°C与WBGT 31°C相比，心率和核心体温分别为126次/分钟对143次/分钟，以及37.4℃对37.5℃（平均差异：17次/分钟[95%CI：7.7 - 26.3]，0.1℃[95%CI： - 0.1 - 0.3]）。最后，博格量表分别为16和18，乳酸水平分别为3.9毫摩尔/升和5.1毫摩尔/升（平均差异：2[95%CI：1 - 3]，1.2毫摩尔/升[95%CI：0.1 - 2.3]）。
在WBGT 31°C和WBGT 21°C条件下，护理专业学生的胸外按压深度无显著差异。对于次要结局，与WBGT 21°C相比WBGT 31°C下旁观者的乳酸水平和疲劳程度增加。在炎热潮湿环境下进行心肺复苏还需要进一步研究。
