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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): 113-121.
Changes of One-handed Chest Compression Qualities According to Rescuer Fatigue and the Effects of Alternating Hands in the Prehospital Setting: Prospective Randomized Pilot Study using Pediatric Manikin Simulation Trial
Gun Hee Jung, Je Hyeok Oh, Chan Woong Kim, Sung Eun Kim, Dong Hoon Lee
Department of Emergency Medicine, College of Medicine, Chung-Ang University, Seoul, Republic of Korea. jehyeok.oh@gmail.com
One-handed chest compression (OHCC) technique is performed by one hand. Therefore chest compression (CC) depth might decrease rapidly. This study will evaluate the patterns of CC depth decaying in performing OHCC and assess the effects of alternating the hand which performs CC on the patterns of CC depth decaying.
This study was designed as a prospective randomized manikin simulation trial. Students of medical college participated. First, 10 students performed OHCC (chest compression:ventilation=30:2) in a pediatric manikin lying on a hard floor for 5 minutes (baseline study). After the baseline study, 32 students were recruited and randomized to group A and B. Group A performed OHCC with hand shift every other cycle (test 1). Group B performed OHCC with hand shift when they feel fatigue (test 2). The compression data were collected using the CPRmeter. The mean compression depths (MCD) were calculated at one minute intervals using the Q-CPR review software. The heart rates were monitored and the fatigue scales were collected every 1 minute.
The MCD values were decreased significantly after 1 minute in the baseline study (p<0.05). However they were not changed in test 1 and decreased significantly after 4 minutes in test 2 (p<0.05). The heart rate and the fatigue scales were increased significantly with time in all tests (p<0.05).
When OHCC was performed without shifting the hand which performed CC, the MCD decreased significantly after 1 minute. However, we could delay the time of decreasing MCD by shifting the hand which performed CC.
Key words: Cardiopulmonary resuscitation, Cardiac arrest, Heart massage, Fatigue
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