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- W3179635229 abstract "Cerebrovascular reactivity (CVR) deficits in adolescents with concussion may persist after resolution of neurological symptoms. Whether or not CVR deficits predict long term neurological function is unknown. We used adolescent mice closed head injury (CHI) models (54 g, 107 cm or 117 cm drop height), followed by blood oxygenation level dependent (BOLD)-functional MRI with CO 2 challenge to assess CVR and brain connectivity. At one week, 3HD 107 cm mice showed delayed BOLD responses (p = 0.0074), normal striatal connectivity , and an impaired respiratory rate response to CO 2 challenge (p = 0.0061 in ΔRmax). The 107 cm group developed rotarod deficits at 6 months (p = 0.02) and altered post-CO 2 brain connectivity (3-fold increase in striatum to motor cortex correlation coefficient) by one year, but resolved their CVR and respiratory rate impairments, and did not develop cognitive or circadian activity deficits. In contrast, the 117 cm group had persistent CVR (delay time: p = 0.016; washout time: p = 0.039) and circadian activity deficits (free-running period: 23.7 hr in sham vs 23.9 hr in 3HD; amplitude: 0.15 in sham vs 0.2 in 3HD; peak activity: 18 in sham vs 21 in 3HD) at one year. Persistent CVR deficits after concussion may portend long-term neurological dysfunction. Further studies are warranted to determine the utility of CVR to predict chronic neurological outcome after mild traumatic brain injury." @default.
- W3179635229 created "2021-07-19" @default.
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- W3179635229 date "2021-07-06" @default.
- W3179635229 modified "2023-09-30" @default.
- W3179635229 title "Persistent CO<sub>2</sub> reactivity deficits are associated with neurological dysfunction up to one year after repetitive mild closed head injury in adolescent mice" @default.
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- W3179635229 doi "https://doi.org/10.1177/0271678x211021771" @default.
- W3179635229 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34229511" @default.
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