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J Korean Soc Emerg Med > Volume 26(2); 2015 > Article
Journal of The Korean Society of Emergency Medicine 2015;26(2): 122-128.
Effects of Counting Chest Compressions on the Performance of Cardiopulmonary Resuscitation: Prospective Randomized Pilot Study Using Manikin Simulation Trial
Je Hyeok Oh, Sung Eun Kim, Chan Woong Kim, Dong Hoon Lee
Department of Emergency Medicine, College of Medicine, Chung-Ang University, Seoul, Republic of Korea. emkse@cau.ac.kr
This study compared the effects of counting chest compressions verbally and silently on the performance of cardiopulmonary resuscitation (CPR).
Forty-six medical students were enrolled in this study. After the participants performed a two-min CPR (Test 1), during which they counted each compression silently, they were divided randomly into Groups A and B. After a 30-min rest, the participants took Test 2. In Test 2, Group A performed two-min CPR, during which the participants counted the number of chest compressions verbally (Test 2A), and in Group B, CPR was performed using the same methods as detailed for Test 1 (i.e., with silent enumeration; Test 2B). Each student counted the number of chest compressions aloud from one to 30 in Test 2A.
No significant differences were observed for either test (Tests 1 and 2) between Groups A and B. Although the mean compression rate (MCR) was increased significantly from 107.2+/-15.4 to 116.3+/-15.9/min between Tests 1 and 2B in Group B (p<0.01), a similar result was also obtained in Group A. In the individual interviews conducted with the Group A participants, all members reported having difficulty breathing while counting the number of chest compressions verbally when compared with silent enumeration.
Tallying the numbers of chest compressions verbally did not significantly alter the performance of CPR.
Key words: Cardiopulmonary resuscitation, Voice
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