Objective: The 2015 American Heart Association guidelines recommended pediatric rescue chest compressions of at least one-third the anteroposterior diameter of the chest, which equates to approximately 5 cm. This study evaluated the appropriateness of these two types by comparing their safeties in chest compression depth simulated by CT. Design: Retrospective study with data analysis conducted from January 2005 to June 2015 Setting: Regional emergency center in South Korea. Patients: Three hundred forty-nine pediatric patients 1–9 years old who had a chest CT scan. Interventions: Simulation of chest compression depths by CT. Measurements and Main Results: Internal and external anteroposterior diameter of the chest and residual internal anteroposterior diameter after simulation were measured from CT scans. The safe cutoff levels were differently applied according to age. One-third external anteroposterior diameters were compared with an upper limit of chest compression depth recommended for adults. Primary outcomes were the rates of overcompression to evaluate safety. Overcompression was defined as a negative value of residual internal anteroposterior diameter—age-specific cutoff level. Using a compression of 5-cm depth simulated by chest CT, 16% of all children (55/349) were affected by overcompression. Those 1–3 years old were affected more than those 4–9 years old (p
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