Cerebrovascular Reactivity Following Spinal Cord Injury.
Alexander Mark Weber, Tom E Nightingale, Michael Jarrett and 7 others
PMID 38799609WHAT IT FOUND
Cerebrovascular response time was 25% slower in grey matter for people with spinal cord injury compared to controls, while overall reactivity was unchanged.
Longer time since injury and more frequent low blood pressure episodes were associated with reduced cerebrovascular capacity.
Key findings
01Response time (tau) in grey matter was significantly longer in participants with SCI compared to noninjured controls.
02Time since injury was negatively correlated with steady-state cerebrovascular reactivity in both grey matter and brainstem.
03Frequency of hypotensive episodes was negatively correlated with cerebrovascular reactivity measures in the grey matter.
STILL TO COME
How it was doneWhat they found
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What it does not show
The sample size was very small (7 SCI, 6 controls) and consisted entirely of male participants, so findings cannot be generalized to women. Blood pressure was not measured during the fMRI scan, so it is unclear if blood pressure changes during the CO2 challenge influenced the cerebrovascular results. The study was cross-sectional, so it cannot prove that low blood pressure or time since injury causes the observed changes in brain blood flow. Participants were not screened for sleep apnea or physical activity levels, which are known to affect cerebrovascular health.
Declared interests
The study was approved by the University of British Columbia Clinical Research Ethics Board. Funding sources and conflicts of interest are not explicitly detailed in the provided text beyond the equipment usage (Thornhill Medical).
The easy way to misread this
Do not interpret the slower cerebrovascular response time as a confirmed cause of cognitive decline or stroke in SCI patients. This was a very small pilot study with only male participants, and the findings are preliminary associations rather than proven mechanisms.