• Dong Hun Kim, Sang-Min Lee, Gyun Moo Kim, Kyung Woo Lee, Seung Hyun Ko, Ye Jin Oh, Young Woo Seo, Suk Hee Lee, and Tae Chang Jang.
• Department of Emergency Medical Technology, Gyeongbuk Provincial College, Yecheon-gun, Gyeongsangbuk-do.
• Medicine (Baltimore). 2021 Feb 12; 100 (6): e24666e24666.

BackgroundCardiopulmonary resuscitation (CPR) performance depends on individual ability and training. Well-trained or professional rescuers can maintain high-quality CPR for longer than laypeople. This study aimed to examine the effects of reducing resting intervals on CPR performance, physiological parameters, and hemodynamic parameters during prolonged CPR in well-trained providers.MethodsThe study enrolled 90 volunteers from the paramedic students of our institution. They were randomly divided into 3 groups: 2 minutes, 1 minute 45 seconds, and 1 minute 30 seconds rest groups. Each participant performed 5 cycles of chest compression only CPR (2 min/cycle) with different resting intervals according to grouping. CPR quality, physiological variations, and hemodynamic variations were measured for each cycle and compared across the groups.ResultsOf the 90 volunteers, 79 well-trained providers were finally included. The variation of the average chest compression depth across the 5 cycles showed significant differences between the 3 groups: from cycle 1 to 2: 1.2 (3.1) mm, -0.8 (2.0) mm, and -2.0 (3.0) mm in the 2 minutes, 1 minute 45 seconds, and 1 minute 30 seconds groups, respectively (P < .001); from cycle 1 to 3: 0.0 (3.0) mm, -0.7 (3.2) mm, and -2.6 (3.9) mm, respectively (P = .030). However, all 3 groups maintained the recommended rate and chest compression depth for all 5 cycles. Physiological and hemodynamic parameters showed no significant differences between the groups.ConclusionsWell-trained providers were able to maintain high-quality CPR despite reducing rest intervals. Adjusting the rest interval may help maintain overall CPR quality in special situations or where layperson rescuers are involved.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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