Related Experiment Video
Updated: Dec 31, 2025
MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges
Published on: December 17, 2014
Persistent alterations in cerebrovascular reactivity in response to hypercapnia following pediatric mild traumatic
Andrew B Dodd1, Hanzhang Lu2, Christopher J Wertz1
1The Mind Research Network/Lovelace Biomedical and Environmental Research Institute, Albuquerque, NM, USA.
Insights
Pediatric mild traumatic brain injury (pmTBI) in adolescents shows persistent cerebrovascular reactivity deficits, impacting sleep, processing speed, and attention beyond 30 days post-injury.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Radiology
Background:
- Mild traumatic brain injury (mTBI) effects on cerebrovascular reactivity are understudied in pediatric populations.
- Adolescent mTBI (pmTBI) may present unique long-term neurological challenges.
Purpose of the Study:
- To investigate cerebrovascular reactivity and clinical outcomes in adolescents following pmTBI.
- To compare neuroimaging and symptom data between pmTBI patients and healthy controls (HC) across injury phases.
Main Methods:
- 30 adolescents with pmTBI and 35 HC underwent clinical and neuroimaging assessments.
- Assessments were conducted during sub-acute (approx. 7 days) and early chronic (approx. 120 days) post-injury phases.
- Blood oxygen-level dependent (BOLD) response to end-tidal CO2 was analyzed in grey-white matter interface areas.
Main Results:
- pmTBI patients reported more initial symptoms (headache, pain, anxiety) that resolved by 4 months.
- Persistent deficits in sleep, processing speed, and attention were observed in pmTBI patients.
- Increased BOLD response latency and altered CO2 reactivity were found in pmTBI patients, persisting into the chronic phase.
Conclusions:
- Cerebrovascular reactivity deficits in pmTBI may persist longer than clinical recovery timelines suggest.
- Altered cerebrovascular function is linked to ongoing sleep disturbances in adolescents post-mTBI.
- Findings highlight the need for extended monitoring of cerebrovascular health after pediatric TBI.
Abstract:
Much attention has been paid to the effects of mild traumatic brain injury (mTBI) on cerebrovascular reactivity in adult populations, yet it remains understudied in pediatric injury. In this study, 30 adolescents (12-18 years old) with pediatric mTBI (pmTBI) and 35 age- and sex-matched healthy controls (HC) underwent clinical and neuroimaging assessments during sub-acute (6.9 ± 2.2 days) and early chronic (120.4 ± 11.7 days) phases of injury. Relative to controls, pmTBI reported greater initial post-concussion symptoms, headache, pain, and anxiety, resolving by four months post-injury. Patients reported increased sleep issues and exhibited deficits in processing speed and attention across both visits. In grey-white matter interface areas throughout the brain, pmTBI displayed increased maximal fit/amplitude of a time-shifted end-tidal CO2 regressor to blood oxygen-level dependent response relative to HC, as well as increased latency to maximal fit. The alterations persisted through the early chronic phase of injury, with maximal fit being associated with complaints of ongoing sleep disturbances during post hoc analyses but not cognitive measures of processing speed or attention. Collectively, these findings suggest that deficits in the speed and degree of cerebrovascular reactivity may persist longer than current conceptualizations about clinical recovery within 30 days.
Related Concept Videos
01:30Alterations in Respiration II
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
01:31Chemical Factors Affecting Respiration Centers
CO2 has a potent influence on respiration and is strictly regulated....