• Jinkun Bae, Tae Nyoung Chung, and Sang Mo Je.
• Department of Emergency Medicine, CHA University School of Medicine, Gyeonggi-Do, Republic of Korea.
• BMJ Open. 2016 Feb 12; 6 (2): e010873.

ObjectivesTo assess how the quality of metronome-guided cardiopulmonary resuscitation (CPR) was affected by the chest compression rate familiarised by training before the performance and to determine a possible mechanism for any effect shown.DesignProspective crossover trial of a simulated, one-person, chest-compression-only CPR.SettingParticipants were recruited from a medical school and two paramedic schools of South Korea.Participants42 senior students of a medical school and two paramedic schools were enrolled but five dropped out due to physical restraints.InterventionSenior medical and paramedic students performed 1 min of metronome-guided CPR with chest compressions only at a speed of 120 compressions/min after training for chest compression with three different rates (100, 120 and 140 compressions/min). Friedman's test was used to compare average compression depths based on the different rates used during training.ResultsAverage compression depths were significantly different according to the rate used in training (p<0.001). A post hoc analysis showed that average compression depths were significantly different between trials after training at a speed of 100 compressions/min and those at speeds of 120 and 140 compressions/min (both p<0.001).ConclusionsThe depth of chest compression during metronome-guided CPR is affected by the relative difference between the rate of metronome guidance and the chest compression rate practised in previous training.Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

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