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Clinical Manifestations.

Xiaoduo Liu1, Tao Wei1, Yi Tang2,3

  • 1Xuanwu Hospital, Capital Medical University, Beijing, Beijing, China.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
PubMed
Summary
This summary is machine-generated.

Alzheimer's disease (AD) patients show impaired glymphatic function and sleep oscillatory circuit coupling. Reduced SO-spindle coupling precision in AD may drive glymphatic clearance issues and cognitive decline.

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Glymphatic System Research

Background:

  • Understanding sleep's role in the glymphatic system is crucial for Alzheimer's disease (AD) research.
  • Glymphatic dysfunction is implicated in cognitive decline associated with AD.

Purpose of the Study:

  • To investigate the relationship between sleep oscillatory circuits and glymphatic system function in AD.
  • To compare glymphatic indices and sleep event coupling between AD patients and healthy controls.

Main Methods:

  • 54 AD patients and 21 cognitively normal (CN) controls underwent neuropsychological evaluation, polysomnography, and multimodal imaging.
  • Sleep oscillatory events (SOs, theta bursts, sleep spindles) and their coupling were analyzed.
  • Glymphatic indices (CP volume, PVSs, DTI-ALPS, BOLD-CSF coupling) were measured and compared.

Main Results:

  • AD patients exhibited poorer glymphatic function and reduced SO-spindle coupling accuracy.
  • Significant differences were found in CP volume, DTI-ALPS, BOLD-CSF coupling, and SO phase between groups.
  • DTI-ALPS mediated the association between SO phase and cognitive/biomarker changes, highlighting sleep's role in glymphatic function.

Conclusions:

  • Sleep oscillatory circuits and the glymphatic system interact, with this interaction diminished in AD.
  • Reduced SO-spindle coupling precision in AD may impair glymphatic clearance, contributing to cognitive decline.