• Johna K Register-Mihalik, Valerie J De Maio, Holly L Tibbo-Valeriote, and John D Wooten.
• *Matthew Gfeller Sport-Related Traumatic Brain Injury Research Center, Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; †The Injury Prevention Research Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC; ‡Emergency Medicine Physicians (EMP), Canton, OH; §Emergency Services Institute, WakeMed Health & Hospitals, Raleigh, NC; ¶Raleigh Neurology Associates, P.A., Raleigh, NC; and ‖WakeMed Concussion Services, WakeMed Health & Hospitals, Raleigh, NC.
• Clin J Sport Med. 2015 Nov 1; 25 (6): 502-8.

ObjectiveThe current study examines the demographics, injury characteristics, and outcomes associated with the presence of postconcussion amnesia in young concussion clinic patients.DesignCross-sectional, retrospective clinical cohort.SettingConcussion services clinic.PatientsPediatric and adolescent concussion services program patients, presenting within 10 days postinjury, aged 10-18 years, with the goal of returning to sport (n = 245).Assessment Of Risk FactorsAge, gender, race, head trauma history, injury mechanism, loss of consciousness (LOC), injury-related visit to an emergency department, cognitive and balance scores, symptoms, and management recommendations.Main Outcome MeasuresUnivariate and multivariate analyses determined adjusted odds ratios for reported presence of any postconcussion amnesia (anterograde or retrograde).ResultsFactors associated with amnesia (univariate, P < 0.10) and included in the multivariate model were race, head trauma history, mechanism of injury, LOC, injury-related visit to an emergency department, management recommendations and time of injury and initial visit symptom severity. Age and gender were also included in the model due to biological significance. Of the 245 patients, 181 had data for all model variables. Of the 181 patients, 58 reported amnesia. History of head trauma [odds ratio (OR), 2.7; 95% confidence interval (CI), 1.3-5.7]; time of injury (TOI) symptom severity >75th percentile (OR, 2.6; 95% CI, 1.2-5.3) and LOC (OR, 2.2; 95% CI, 1.1-4.6) were found to have significant and independent relationships with amnesia in the multivariate model.ConclusionsThis study illustrates that patients presenting with postconcussion amnesia are more likely to have a history of head trauma, LOC, and greater symptom severity. Future research is needed to better understand amnesia following concussion.Clinical RelevanceAmnesia presence, previous head trauma, LOC, and increased symptom severity may aid in identifying patients with a greater initial injury burden who warrant closer observation and more conservative management.

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