• Yeongtak Song, Youngjoon Chee, Jaehoon Oh, Chiwon Ahn, and Tae Ho Lim.
• Convergence Technology Center for Disaster Preparedness, Hanyang University, Seoul, Republic of Korea.
• Resuscitation. 2016 Jun 1; 103: 20-23.

BackgroundRecently, there have been attempts to use smartphones and smartwatches as the feedback devices to improve the quality of chest compressions. In this study, we compared chest compression depth feedback accuracy between a smartphone and a smartwatch in a hands-only cardiopulmonary resuscitation scenario, using a manikin with a displacement sensor system.MethodsTen basic life support providers participated in this study. Guided by the chest compression depths displayed on the monitor of a laptop, which received data from the manikin, each participant performed 2min of chest compressions for each target depth (35mm and 55mm) on a manikin while gripping a smartphone and wearing a smartwatch. Participants had a rest of 1h between the instances, and the first target depth was set at random. Each chest compression depth data value from the smartphone and smartwatch and a corresponding reference value from the manikin with the displacement system were recorded. To compare the accuracy between the smartphone and smartwatch, the errors, expressed as the absolute of the differences between the reference and each device, were calculated.ResultsAt both target depths, the error of the smartwatch were significantly smaller than that of the smartphone (the errors of the smartphone vs. smartwatch at 35mm: 3.4 (1.3) vs. 2.1 (0.8) mm; p=0.008; at 55mm: 5.3 (2.8) vs. 2.3 (0.9) mm; p=0.023).ConclusionThe smartwatch-based chest compression depth feedback was more accurate than smartphone-based feedback.Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

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