Zhan Lei, He Qing, Zhou Ya-xiong
Emergency Department of West China Hospital, Sichuan University, Chengdu, Sichuan, China.
Zhongguo Wei Zhong Bing Ji Jiu Yi Xue. 2010 Feb;22(2):76-8.
To compare the effective power of external chest compression and degree of exhaustion of rescue crew using different methods of counting, in order to establish a more appropriate and standard method of counting.
Forty-eight subjects who had received formal training in basic life support (BLS) and advanced life support (ALS) were recruited randomly from doctors and nurses working in the emergency departments. The methods of counting were randomly selected which was performed first, and then they performed continuous chest compressions for 3 minutes using two different methods of counting with 30 minutes apart on the manikin, which was used in the hospital for cardiopulmonary resuscitation (CPR) training. The total number of compressions was recorded, and the number of those which were considered satisfactory, the peak heart rate of the performer and the time to reach peak heart were all recorded. Feeling of fatigue and discomfort was evaluated by self-reported survey results with the use of a visual analogue scale (VAS).
The total number of compressions attempted, the effective power of external chest compression and the mean compression depth when rescuers counted form 1 to 10, which were repeated for 3 times, were greater than those when rescuers counted from 1 to 30 during 3 minutes of CPR [(202.40+/-6.52) times vs. (173.50+/-5.68) times, (67.48+/-2.00)% vs. (57.81+/-2.00)%, (4.45+/-0/.34) cm vs. (4.05+/0.21) cm, all P<0.01]. The VAS scores (22.15+/-3.09) was lower than that when rescuers counted them from 1 to 30 (31.10+/-4.09, P<0.01). The time to reach peak heart rate [(124.88+/-5.40) s] was longer than that when rescuers counted them from 1 to 30 [(106.15+/-6.80) s, P<0.01]. There was no difference in peak heart rate between two methods of counting.
The effective power of external chest compression is greater when rescuers counted from 1 to 10 with repetition for 3 times than that when rescuers counted continuously from 1 to 30 during CPR. The method of counting from 1 to 10 with repetition for 3 times can save physical energy of rescue crew, so it can improve the quality of CPR to some extent.
比较采用不同计数方法时胸外按压的有效率及救援人员的疲惫程度，以建立更合适、规范的计数方法。
从急诊科工作的医生和护士中随机招募48名接受过基础生命支持（BLS）和高级生命支持（ALS）正规培训的受试者。随机选择计数方法并首先进行，然后他们在医院用于心肺复苏（CPR）培训的人体模型上，使用两种不同的计数方法，间隔30分钟进行3分钟的持续胸外按压。记录按压总数、被认为满意的按压次数、执行者的心率峰值及达到峰值的时间。通过使用视觉模拟量表（VAS）的自我报告调查结果评估疲劳和不适感受。
在CPR的3分钟内，救援人员从1数到10并重复3次时尝试的按压总数、胸外按压的有效率及平均按压深度，均大于救援人员从1数到30时的情况[（202.40±6.52）次对（173.50±5.68）次，（67.48±2.00）%对（57.81±2.00）%，（4.45±0.34）cm对（4.05±0.21）cm，均P<0.01]。VAS评分（22.15±3.09）低于救援人员从1数到30时的评分（31.10±4.09，P<0.01）。达到心率峰值的时间[（124.88±5.40）秒]长于救援人员从1数到30时的时间[（106.15±6.80）秒，P<0.01]。两种计数方法的心率峰值无差异。
在CPR期间，救援人员从1数到10并重复3次时胸外按压的有效率高于从1连续数到30时。从1数到10并重复3次的计数方法可节省救援人员的体力，因此在一定程度上可提高CPR质量。
