ArticleAlzheimer's & dementia : the journal of the Alzheimer's Association2026
The role of vascular risk factors in white matter tract microstructure: a multi-cohort study in older adults.
Article in Alzheimer's & dementia : the journal of the Alzheimer's Association, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionVascular risk factors (VRFs) contribute to white matter microstructural degeneration, but their tract-specific contributions are unclear. We assessed the independent associations of four major VRFs with white matter microstructure in a large, multi-cohort study.
methodsDiffusion magnetic resonance imaging data from five harmonized cohorts were free water (FW) corrected (n = 2961, 73.00 ± 9.27 years, 59.34% female). We associated body mass index (BMI) and presence of hypertension, diabetes, and heart disease with FW and FW-corrected diffusion metrics (fractional anisotropy, mean diffusivity, axial diffusivity, radial diffusivity) in 48 tracts.
resultsHypertension and heart disease showed the most robust and widespread independent associations with white matter microstructure. In contrast, diabetes associations were attenuated in sensitivity analyses, while BMI associations were inconsistent across metrics. DISCUSSION: Hypertension and heart disease are associated most strongly with white matter microstructure, suggesting that tighter management of these conditions may more reliably yield benefits in preserving white matter health.
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