Discriminating Young Children with Concussion in an Outpatient Specialty Clinic from Healthy Controls Using the Child SCAT5

Post-concussion changes in the N200 and P300 ERPs are associated with cognitive symptoms and performance

PURPOSE

To examine how post-concussion changes to the N200 and P300 event-related potentials (ERPs) are associated with cognitive symptoms and neurocognitive performance.

METHODS

High-density electroencephalography (EEG) was recorded during a Go/No-Go task from 16 young adults within one month after their concussion and 16 matched controls. Participants were also administered the Cognitive-Linguistic Quick Test (CLQT) and self-reported concussion-like symptoms. Mixed analysis of variance models compared the N200/P300 ERPs between concussion and control groups. Nested linear regressions examined associations between the N200/P300 ERPs and CLQT cognitive domains, cognitive symptom clusters, and total concussion symptoms, with particular interest in within-task changes in the N200/P300 ERPs (e.g. habituation).

RESULTS

N200 and P300 ERP amplitudes were associated with individual differences in cognitive outcomes after concussion. For concussion participants only, smaller P300 amplitudes were significantly associated with greater cognitive symptoms. When considering within-task changes in ERPs over repeated trial presentations, reduced habituation of N200 amplitudes was significantly associated with poorer attention and memory CLQT domain scores. Reduced habituation of P300 amplitudes was also associated with greater cognitive symptoms and total symptoms for concussion participants.

CONCLUSION

Within-task changes in ERP dynamics supporting attention and executive control are associated with individual differences in cognitive outcomes after concussion.

Multidomain Predictors of Protracted Recovery following Concussion among 5- to 9-Year-Old Patients: A Preliminary Study

OBJECTIVE

To determine which components from a multidomain assessment best predict protracted recovery in pediatric patients with a concussion.

STUDY DESIGN

A prospective cohort of patients aged 5-9 years who presented within 21 days of concussion to a specialty clinic were categorized into normal (≤30 days) and protracted (>30 days) recovery. Participants provided demographic and medical history information, and completed the Child Sport Concussion Assessment Tool-5 symptom report and balance assessment, the Vestibular/Ocular Motor Screen-Child (VOMS-C), and the Pediatric Immediate Post-concussion Assessment and Cognitive Testing. Univariate logistic regressions (LR) were used to inform a follow-up forward stepwise LR to identify the best predictors of protracted recovery. Receiver operating characteristic analysis of the area under the curve (AUC) was used to identify which predictors retained from the LR model best discriminated recovery.

RESULTS

The final sample included 68 patients (7.52 ± 2.3 years; 56% male), 36 (52.9%) with normal and 32 (47.1%) with protracted recovery. Results of the LR to identify protracted recovery were significant (P < .001) and accounted for 39% of the variance. The model accurately classified 78% of patients, with days to first clinic visit (OR, 1.2; 95% CI, 1.1-1.4; P = .003) and positive VOMS-C findings (OR, 8.32; 95% CI, 2.4-28.8; P < .001) as significant predictors. A receiver operating characteristic analysis of the AUC of this 2-factor model discriminated protracted from normal recovery (AUC, 0.82; 95% CI, 0.71-0.92; P < .001).

CONCLUSIONS

Days to first clinic visit and positive findings on the VOMS-C were the most robust predictors of protracted recovery after concussion in young pediatric patients.

Acute evaluation of sport-related concussion and implications for the Sport Concussion Assessment Tool (SCAT6) for adults, adolescents and children: a systematic review

OBJECTIVES

To systematically review the scientific literature regarding the acute assessment of sport-related concussion (SRC) and provide recommendations for improving the Sport Concussion Assessment Tool (SCAT6).

DATA SOURCES

Systematic searches of seven databases from 2001 to 2022 using key words and controlled vocabulary relevant to concussion, sports, SCAT, and acute evaluation.

ELIGIBILITY CRITERIA

(1) Original research articles, cohort studies, case-control studies, and case series with a sample of >10; (2) ≥80% SRC; and (3) studies using a screening tool/technology to assess SRC acutely (<7 days), and/or studies containing psychometric/normative data for common tools used to assess SRC.

DATA EXTRACTION

Separate reviews were conducted involving six subdomains: Cognition, Balance/Postural Stability, Oculomotor/Cervical/Vestibular, Emerging Technologies, and Neurological Examination/Autonomic Dysfunction. Paediatric/Child studies were included in each subdomain. Risk of Bias and study quality were rated by coauthors using a modified SIGN (Scottish Intercollegiate Guidelines Network) tool.

RESULTS

Out of 12 192 articles screened, 612 were included (189 normative data and 423 SRC assessment studies). Of these, 183 focused on cognition, 126 balance/postural stability, 76 oculomotor/cervical/vestibular, 142 emerging technologies, 13 neurological examination/autonomic dysfunction, and 23 paediatric/child SCAT. The SCAT discriminates between concussed and non-concussed athletes within 72 hours of injury with diminishing utility up to 7 days post injury. Ceiling effects were apparent on the 5-word list learning and concentration subtests. More challenging tests, including the 10-word list, were recommended. Test-retest data revealed limitations in temporal stability. Studies primarily originated in North America with scant data on children.

CONCLUSION

Support exists for using the SCAT within the acute phase of injury. Maximal utility occurs within the first 72 hours and then diminishes up to 7 days after injury. The SCAT has limited utility as a return to play tool beyond 7 days. Empirical data are limited in pre-adolescents, women, sport type, geographical and culturally diverse populations and para athletes.

PROSPERO REGISTRATION NUMBER

CRD42020154787.