Evidence map›Paper›PMID 40425804›Full record

ArticleNature biomedical engineering2025

A wireless device for continuous measurement of brain parenchymal resistance tracks glymphatic function in humans.

Paul Dagum, Laurent Giovangrandi, Swati Rane Levendovszky, Jake J Winebaum, Tarandeep Singh, Yeilim Cho, Robert M Kaplan, Michael S Jaffee, Miranda M Lim, Carla Vandeweerd and 1 more

Abstract read
In one paragraph

Article in Nature biomedical engineering, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

17 citing papers in PubMed.

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  8. Wake-promoting neuromodulators in Alzheimer's disease: Implications for sleep and brain clearance.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors.

Paul DagumApplied Cognition Inc., Redwood City, CA, USA. paul@appliedcognition.com.ORCID http://orcid.org/0000-0002-9843-4039
Laurent GiovangrandiApplied Cognition Inc., Redwood City, CA, USA.
Swati Rane LevendovszkyDepartment of Radiology, University of Washington School of Medicine, Seattle, WA, USA.
Jake J WinebaumApplied Cognition Inc., Redwood City, CA, USA.
Tarandeep SinghApplied Cognition Inc., Redwood City, CA, USA.
Yeilim ChoVISN 20 NW Mental Illness Research, Education and Clinical Center, VA Puget Sound Healthcare System, Seattle, WA, USA.
Robert M KaplanClinical Excellence Research Center, Stanford University School of Medicine, Stanford, CA, USA.
Michael S JaffeeDepartment of Neurology, University of Florida Health, Gainesville, FL, USA.
Miranda M LimVISN 20 Northwest Mental Illness Research, Education and Clinical Center (MIRECC), VA Portland Health Care System, Portland, OR, USA.ORCID http://orcid.org/0000-0003-3876-3196
Carla VandeweerdUniversity of Florida Health Precision Health Research Center, Clinical and Translational Science Institute, University of Florida, Gainesville, FL, USA.
Jeffrey J IliffVISN 20 NW Mental Illness Research, Education and Clinical Center, VA Puget Sound Healthcare System, Seattle, WA, USA.

Funding

University of Washington Alzheimer's Disease Research CenterP30AG066509 · NIA · UNIVERSITY OF WASHINGTON · PI Thomas J. Grabowski · 2020 to 2026
$29.0M
Research Education ComponentP30AG066518 · NIA · OREGON HEALTH & SCIENCE UNIVERSITY · PI Zachary Beattie · 2020 to 2026
$28.6M
Role of Sleep Disruption after mTBI as a Driver of Chronic Post-traumatic HeadacheR01NS129573 · NINDS · SEATTLE INST FOR BIOMEDICAL/CLINICAL RES · PI Jeffrey J Iliff, Andrew F Russo · 2023 to 2026
$2.4M
BLRD VA IK2 BX002712NIA NIH HHS P30 AG066509NIA NIH HHS P30 AG066518NINDS NIH HHS R01 NS129573
6 · The paper itself

Abstract

Glymphatic function in animal models supports the clearance of brain proteins whose mis-aggregation is implicated in neurodegenerative conditions including Alzheimer's and Parkinson's disease. The measurement of glymphatic function in the human brain has been elusive due to invasive, bespoke and poorly time-resolved existing technologies. Here we describe a non-invasive multimodal device for the continuous measurement of sleep-active changes in parenchymal resistance in humans using repeated electrical impedance spectroscopy measurements in two separate clinical validation studies. Device measurements successfully paralleled sleep-associated changes in extracellular volume that regulate glymphatic function and predicted glymphatic solute exchange measured by contrast-enhanced MRI. We replicate preclinical findings showing that glymphatic function is increased with increasing sleep electroencephalogram (EEG) delta power and is decreased with increasing sleep EEG beta power and heart rate. The present investigational device permits the continuous and time-resolved assessment of parenchymal resistance in naturalistic settings necessary to determine the contribution of glymphatic impairment to risk and progression of Alzheimer's disease and to enable target-engagement studies that modulate glymphatic function in humans.

Indexed as

BrainGlymphatic SystemWireless TechnologyAdultAgedAlzheimer DiseaseDielectric SpectroscopyElectric ImpedanceElectroencephalographyFemaleHumansMagnetic Resonance ImagingMaleMiddle AgedSleep

Identifiers

PMID40425804
PMCPMC12532611

What OpenQuestion holds

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LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.