• Je Hyeok Oh, Sung Eun Kim, Chan Woong Kim, and Dong Hoon Lee.
• Department of Emergency Medicine, College of Medicine, Chung-Ang University, Seoul, Korea.
• Emerg Med Australas. 2015 Apr 1;27(2):108-12.

ObjectiveBecause the one-handed chest compression (OHCC) technique uses one hand, unlike the two-handed chest compression (THCC) technique, compression depth might be reduced more rapidly in OHCC than THCC. The present study was conducted to determine whether compression depth was affected within 2 min after the start of OHCC in a simulated in-hospital paediatric arrest model.MethodsForty medical doctors performed continuous OHCC on a child manikin lying on a hard floor using a CPRmeter for 2 min. The hand used to perform the OHCC technique was randomised to the right or left hand. The mean compression depth (MCD) and the mean compression rate (MCR) were calculated at 30 s intervals using the Q-CPR review software.ResultsMCD values decreased significantly with time (0-30 s: 44.3 ± 4.1 mm, 30-60 s: 42.4 ± 4.9 mm, 60-90 s: 40.5 ± 5.8 mm, and 90-120 s: 38.7 ± 5.7 mm; P < 0.001). The MCR also tended to decrease with time (0-30 s: 119.3 ± 12.5/min, 30-60 s: 119.0 ± 13.1/min, 60-90 s: 117.9 ± 14.5/min, 90-120 s: 117.8 ± 14.9/min), and the differences were statistically significant between 30-60 s and 60-90 s (P = 0.037) and between 30-60 s and 90-120 s (P = 0.043).ConclusionsCompression depth was decreased significantly from 30 s onwards after starting the OHCC technique using a simulated paediatric arrest model. The results of the present study suggest that future strategies should be established to prevent a decrease in compression depth within 1 min during OHCC.© 2015 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine.

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