• Mark L Ryan, Robert M Van Haren, Chad M Thorson, David M Andrews, Eduardo A Perez, Holly L Neville, Juan E Sola, and Kenneth G Proctor.
• Dewitt-Daughtry Department of Surgery, Divisions of Trauma and Surgical Critical Care, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
• J. Pediatr. Surg. 2014 Aug 1;49(8):1295-9.

PurposeCoagulation changes in pediatric trauma patients are not well defined. To fill this gap, we tested the hypothesis that trauma evokes a hypercoagulable response.MethodsA prospective observational study was conducted in hospitalized patients (age 8months to 14years) admitted for trauma or elective surgery. Informed consent was obtained from the parents and informed assent was obtained in patients 7years of age or older. Coagulation changes were evaluated on fresh whole blood using thromboelastography (TEG) and on stored plasma using assays for special clotting factors.ResultsForty three patients (22 trauma, median injury severity score =9; and 21 uninjured controls) were evaluated. For trauma vs control, prothrombin time (PT) was higher by about 10% (p<0.001), but activated partial thromboplastin time was not altered. TEG clotting time (R;p=0.005) and fibrin cross-linking were markedly accelerated (K time, alpha angle; p<0.001) relative to the control patients. d-Dimer, Prothrombin Fragment 1+2, and Plasminogen Activator Inhibitor-1 were all elevated, whereas Protein S activity was reduced (all p<0.01). Importantly, a large fraction of TEG values and clotting factor assays in the pediatric control group were outside the published reference ranges for adults.ConclusionA hypercoagulable state is associated with minor trauma in children. More work is needed to determine the functional significance of these changes and to establish normal pediatric reference ranges.Copyright © 2014 Elsevier Inc. All rights reserved.

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