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Roby PR, Mozel AE, Grady MF, Master CL, Arbogast KB. Neurovascular Coupling in Acutely Concussed Adolescent Patients. J Neurotrauma 2024; 41:e1660-e1667. [PMID: 38468544 DOI: 10.1089/neu.2023.0192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024] Open
Abstract
Neurovascular coupling (NVC) uniquely describes cerebrovascular response to neural activation and has demonstrated impairments following concussion in adult patients. It is currently unclear how adolescent patients experience impaired NVC acutely following concussion during this dynamic phase of physiological development. The purpose of this study was to investigate NVC in acutely concussed adolescent patients relative to controls. We recruited patients presenting to a sports medicine practice within 28 days of a concussion or a musculoskeletal injury (controls). Transcranial Doppler ultrasound was used to measure changes in patients' posterior cerebral artery (PCA) velocity in response to two progressively challenging visual tasks: (1) reading and (2) visual search. Each task was presented in five 1-min trials (20 sec eyes closed/40 sec eyes open). Resting PCA velocity data were derived by averaging PCA velocity across a 2-min baseline period that preceded the visual tasks. Filtered task data were converted to time-series curves representing 40 consecutive 1-sec averages for each trial. Curves were then averaged across the five trials and time-aligned to stimulus onset (eyes open) to generate a single ensemble-averaged 40-sec curve representing NVC response for each participant for each task. Independent t tests were used to assess group differences (concussion vs. control) in resting PCA velocity. Separate linear mixed-effects models were used to evaluate group differences (concussion vs. control) in NVC response profiles for both visual tasks and group-by-task interaction. Twenty-one concussion patients (female = 8 [38.1%]; age = 14.4 ± 1.9 years) and 20 controls (female = 7 [35.0%]; age = 14.4 ± 1.9 years) were included in our analysis. Average resting PCA velocity did not significantly differ between concussion patients (36.6 ± 8.0 cm/sec) and controls (39.3 ± 8.5 cm/sec) (t39 = 1.06; p = 0.30). There were no significant group differences in relative NVC response curves during the reading task (F1,1560 = 2.23; p = 0.14) or the visual search task (F1,1521 = 2.04; p = 0.15). In contrast, the differential response to task (e.g., increase from reading task to visual search task) was significantly greater in concussion patients than in controls (p < 0.0001). The NVC response to the visual search task was 7.1% higher than the response to reading in concussion patients relative to being 5.5% higher in controls. Our data indicate that concussed patients present with a significantly greater response to more difficult tasks than do controls, suggesting that concussed adolescents require increased neural resource allocation as task difficulty increases. The study provides insight into the neurophysiological consequences of concussion in adolescent patients.
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Affiliation(s)
- Patricia R Roby
- Center for Injury Research and Prevention, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Anne E Mozel
- Center for Injury Research and Prevention, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Matthew F Grady
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Sports Medicine Performance Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Christina L Master
- Center for Injury Research and Prevention, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Sports Medicine Performance Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Kristy B Arbogast
- Center for Injury Research and Prevention, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Emergency Medicine, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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Pearson R, Sheridan CA, Kang K, Brown A, Baham M, Asarnow R, Giza CC, Choe MC. Post-Concussive Orthostatic Tachycardia is Distinct from Postural Orthostatic Tachycardia Syndrome (POTS) in Children and Adolescents. Child Neurol Open 2022; 9:2329048X221082753. [PMID: 35647216 PMCID: PMC9136088 DOI: 10.1177/2329048x221082753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 01/14/2022] [Accepted: 02/03/2022] [Indexed: 12/01/2022] Open
Abstract
Background: Orthostatic tachycardia (OT) affects some patients after
concussion/mild traumatic brain injury (mTBI). In this study, we sought to
identify the factors associated with increased risk for OT in patients with
mTBI. Methods: We conducted a retrospective review of 268 patients
(8-25 years) with mTBI/concussion to determine the prevalence of OT, defined as
orthostatic heart rate change ≥40 bpm for those ≤19 years of age and ≥30 bpm on
active standing test for those >19 years of age. Results: Among
the study population, 7% (n = 19) exhibited post-concussive OT. The only
significant difference between OT and non-OT groups was that history of prior
concussion was more prevalent in the OT group. Conclusion: A
substantial subset (7%) of concussion clinic patients exhibit OT. While POTS
literature describes female and adolescent predominance, post-concussive OT had
similar prevalence across age and gender groups in this study, suggesting that
it may be distinct from POTS.
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Affiliation(s)
- Rachel Pearson
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
- Division of Pediatric Neurology, UC-Los Angeles Mattel Children’s Hospital, David Geffen School of Medicine, Los Angeles, CA, USA
- Children’s Hospital Orange County, Orange, California, USA
| | - Christopher A. Sheridan
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
- Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Kaylee Kang
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
| | - Anne Brown
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
| | - Michael Baham
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
- UC-Irvine School of Medicine, Irvine, CA, USA
| | - Robert Asarnow
- Psychiatry and Biobehavioral Science, University of California-Los Angeles, Los Angeles, CA, USA
| | - Christopher C. Giza
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
- Division of Pediatric Neurology, UC-Los Angeles Mattel Children’s Hospital, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Meeryo C. Choe
- UC-Los Angeles Steve Tisch BrainSPORT Program, UCLA Easton Clinic for Brain Health, Los Angeles, CA, USA
- Division of Pediatric Neurology, UC-Los Angeles Mattel Children’s Hospital, David Geffen School of Medicine, Los Angeles, CA, USA
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Asken BM, Rabinovici GD. Identifying degenerative effects of repetitive head trauma with neuroimaging: a clinically-oriented review. Acta Neuropathol Commun 2021; 9:96. [PMID: 34022959 PMCID: PMC8141132 DOI: 10.1186/s40478-021-01197-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 05/07/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND AND SCOPE OF REVIEW Varying severities and frequencies of head trauma may result in dynamic acute and chronic pathophysiologic responses in the brain. Heightened attention to long-term effects of head trauma, particularly repetitive head trauma, has sparked recent efforts to identify neuroimaging biomarkers of underlying disease processes. Imaging modalities like structural magnetic resonance imaging (MRI) and positron emission tomography (PET) are the most clinically applicable given their use in neurodegenerative disease diagnosis and differentiation. In recent years, researchers have targeted repetitive head trauma cohorts in hopes of identifying in vivo biomarkers for underlying biologic changes that might ultimately improve diagnosis of chronic traumatic encephalopathy (CTE) in living persons. These populations most often include collision sport athletes (e.g., American football, boxing) and military veterans with repetitive low-level blast exposure. We provide a clinically-oriented review of neuroimaging data from repetitive head trauma cohorts based on structural MRI, FDG-PET, Aβ-PET, and tau-PET. We supplement the review with two patient reports of neuropathology-confirmed, clinically impaired adults with prior repetitive head trauma who underwent structural MRI, FDG-PET, Aβ-PET, and tau-PET in addition to comprehensive clinical examinations before death. REVIEW CONCLUSIONS Group-level comparisons to controls without known head trauma have revealed inconsistent regional volume differences, with possible propensity for medial temporal, limbic, and subcortical (thalamus, corpus callosum) structures. Greater frequency and severity (i.e., length) of cavum septum pellucidum (CSP) is observed in repetitive head trauma cohorts compared to unexposed controls. It remains unclear whether CSP predicts a particular neurodegenerative process, but CSP presence should increase suspicion that clinical impairment is at least partly attributable to the individual's head trauma exposure (regardless of underlying disease). PET imaging similarly has not revealed a prototypical metabolic or molecular pattern associated with repetitive head trauma or predictive of CTE based on the most widely studied radiotracers. Given the range of clinical syndromes and neurodegenerative pathologies observed in a subset of adults with prior repetitive head trauma, structural MRI and PET imaging may still be useful for differential diagnosis (e.g., assessing suspected Alzheimer's disease).
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Affiliation(s)
- Breton M. Asken
- Department of Neurology, Memory and Aging Center, Weill Institute for Neurosciences, University of California, San Francisco, 675 Nelson Rising Lane, Suite 190, San Francisco, CA 94143 USA
| | - Gil D. Rabinovici
- Departments of Neurology, Radiology & Biomedical Imaging, Memory and Aging Center, Weill Institute for Neurosciences, University of California, San Francisco, 675 Nelson Rising Lane, Suite 190, San Francisco, CA 94143 USA
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