• Shunichiro Nakao, Yusuke Katayama, Atsushi Hirayama, Tomoya Hirose, Kenichiro Ishida, Yutaka Umemura, Jotaro Tachino, Takeyuki Kiguchi, Tasuku Matsuyama, Kosuke Kiyohara, Tetsuhisa Kitamura, Yuko Nakagawa, and Takeshi Shimazu.
• Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School of Medicine, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan. shunichironakao@hp-emerg.med.osaka-u.ac.jp.
• Eur J Trauma Emerg Surg. 2022 Jun 1; 48 (3): 2047-2057.

PurposeThe aim of this study was to describe epidemiologic features of pediatric blunt renal trauma.MethodsWe performed a retrospective analysis using the Japan Trauma Data Bank over 15 years. We included patients younger than 18 years with blunt renal trauma. We analyzed temporal trends and variations across age groups in patient characteristics, intervention, and in-hospital mortality. We also assessed factors associated with in-hospital mortality.ResultsWe identified 435 pediatric patients with blunt renal trauma. Their median age was 14 years and median Injury Severity Score (ISS) was 17. The most common mechanism of injury was traffic accident in all age groups. Nephrectomy was performed in 3.2%, and the overall in-hospital mortality was 4.6%, both of which showed decreasing trends. The most common mechanism of injury by age group was a pedestrian accident in infants/toddlers/preschoolers (43.5%), pedestrian accident in middle childhood (18.5%), bicycle accident in young teens (24.7%), and motorcycle accident in teenagers (41.2%). Sports-related injury was common in young teens (23.3%) and teenagers (15.2%). Factors such as ISS, shock, concomitant injury, and nephrectomy were associated with high in-hospital mortality.ConclusionsWe described decreasing trends in nephrectomy and in-hospital mortality in pediatric blunt renal trauma and found traffic accident and sports-related injury were common in the pediatric population in Japan.© 2021. Springer-Verlag GmbH Germany, part of Springer Nature.

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