Neurodegeneration
Does T2DM impair glymphatic flow on DTI-ALPS?
Open access · cc by · source: Europe PMC
In 30 adults, longer T2DM history tracked with lower ALPS-index values, suggesting reduced perivascular water diffusivity.
How this study connects
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How close any of these markers is to clinical use differs by orders of magnitude, and the authors disagree with the framing more than with each other. Tau PET separates two diseases at 94.1% in a selected sample, while the Parkinson's model's mid-70s accuracy is explicitly not a standalone diagnostic test, and the glymphatic ALPS index is a diffusion proxy not shown to equal cerebrospinal fluid clearance.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
How close any of these markers is to clinical use differs by orders of magnitude, and the authors disagree with the framing more than with each other. Tau PET separates two diseases at 94.1% in a selected sample, while the Parkinson's model's mid-70s accuracy is explicitly not a standalone diagnostic test, and the glymphatic ALPS index is a diffusion proxy not shown to equal cerebrospinal fluid clearance.
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.
Inspect source passages
Does T2DM impair glymphatic flow on DTI-ALPS?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Sample comprised 30 participants (mean age ~66).
We studied 30 patients (14 males and 17 females; mean 66 years old; age range 56–75 years ), 10 T2DM patients with a history of more than 10 years, 10 T2DM patients with a history of fewer than 10 years, and 10 normal people in the control group.
ALPS-index differed between <10 y and ≥10 y T2DM groups at P < 0.001.
significant difference in the ALPS-index values between <10 y T2DM group and ≥10 y T2DM group ( P < 0.001)
Key findings
ALPS-index and perivascular-aligned diffusivity differed by T2DM history (key contrasts P < 0.001); authors interpret lower ALPS as glymphatic impairment.
Methodology
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).
Limitations
Causal proof that diabetes damages glymphatics, or that ALPS equals true CSF clearance; sample is small and cross-sectional.
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