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Summary
This summary is machine-generated.

Higher cerebrovascular reactivity (CVR) significantly reduces the risk of enlarged perivascular spaces (ePVS) and white matter hyperintensities (WMH). CVR deficits may indicate early changes contributing to these cerebral small vessel disease pathologies.

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Area of Science:

  • Neurology
  • Neuroimaging
  • Cerebrovascular Disease Research

Background:

  • Enlarged perivascular spaces (ePVS) and white matter hyperintensities (WMH) are common co-occurring indicators of cerebral small vessel disease.
  • Cerebrovascular dysfunction's impact on ePVS and WMH has been underexplored.
  • Cerebrovascular reactivity (CVR) is a dynamic marker of cerebrovascular function.

Purpose of the Study:

  • To investigate differences in CVR among individuals with no ePVS/WMH, only ePVS, only WMH, and both ePVS and WMH.
  • To determine if impaired cerebrovascular function increases the risk for these pathologies.
  • To assess CVR as a potential early marker for cerebral small vessel disease.

Main Methods:

  • Recruited 118 non-demented, non-stroke older adults (mean age 68.4).
  • Utilized pseudo-continuous arterial spin labeling (pCASL) MRI to quantify whole-brain CVR during hypercapnia.
  • Scored ePVS in the centrum semiovale (CS) and WMH using the Fazekas scale.

Main Results:

  • A significant difference in CVR was observed across the four groups (p=.021).
  • Individuals with both ePVS and WMH exhibited lower CVR compared to those without either pathology.
  • Higher CVR was associated with a decreased risk of combined ePVS and WMH (OR=0.78, p=.035), even after adjusting for age and sex.

Conclusions:

  • Elevated CVR is linked to a substantially lower risk of developing combined WMH and ePVS-CS.
  • CVR deficits may represent early pathological changes in cerebral small vessel disease.
  • Future research should explore regional CVR differences and their long-term impact on cognition.