Does T2DM impair glymphatic flow on DTI-ALPS?
In 30 adults, longer T2DM history tracked with lower ALPS-index values, suggesting reduced perivascular water diffusivity.
Source
Evaluation of Glymphatic System Using Diffusion MR Technique in T2DM Cases
Study at a glance
- Design
- Case-control — DTI-ALPS comparison of T2DM duration groups vs controls
- N
- N=30 · 10 ≥10 y T2DM, 10 <10 y T2DM, 10 controls
- Population
- Adults with type 2 diabetes and age-matched controls imaged at lateral ventricle body plane
- Outcome
- Directional diffusivities and ALPS-index as glymphatic activity markers
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Calculated directional diffusivities and ALPS-index from DTI at the lateral ventricle body in ≥10 y T2DM, <10 y T2DM, and controls (n=10 each).
What they found
ALPS-index and perivascular-aligned diffusivity differed by T2DM history (key contrasts P < 0.001); authors interpret lower ALPS as glymphatic impairment.
The limits
What it doesn't show
Causal proof that diabetes damages glymphatics, or that ALPS equals true CSF clearance; sample is small and cross-sectional.
Key terms
- Glymphatic system
- Perivascular CSF–ISF clearance pathway for brain waste including Aβ.
- DTI-ALPS
- Diffusion tensor analysis along the perivascular space.
- ALPS-index
- Ratio indexing diffusivity along vs across perivascular orientations.
- Perivascular space
- Fluid sheath around vessels where glymphatic flow occurs.
- T2DM
- Type 2 diabetes mellitus, a risk factor for cognitive decline.
- Projection/association fibers
- White-matter bundles used as landmarks for ALPS ROI placement.
Flashcards
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
Quiz yourself
DTI-ALPS primarily indexes diffusivity along which anatomy?
Common questions
What was N?
30 (10 per group).
Main imaging metric?
ALPS-index from DTI.
Key pattern?
Longer T2DM → lower ALPS / impaired perivascular diffusivity.
Clinical takeaway?
Non-invasive marker candidate for diabetes-related glymphatic change.
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