Evidence map›Paper›PMID 31786748›Full record

ArticleSleep & breathing = Schlaf & Atmung2020

Sleep spindles, K-complexes, limb movements and sleep stage proportions may be biomarkers for amnestic mild cognitive impairment and Alzheimer's disease.

Shunjie Liu, Junhao Pan, Ke Tang, Qingfeng Lei, Lu He, Yangyang Meng, Xiaodong Cai, Zhong Li

Abstract read
PubMed Publisher
In one paragraph

Article in Sleep & breathing = Schlaf & Atmung, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
35citing papers in PubMed, 2 pooled it
3.2field-weighted citation impact, top 8% of its field
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

35 citing papers in PubMed, 2 syntheses or guidelines pooled it, 65 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
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  4. Observational
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  6. Review
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  10. Tauopathy after long-term cervical lymphadenectomy.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025
    Article
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  12. Differential expression of spatiotemporal sleep spindle clusters in aging.Sleep advances : a journal of the Sleep Research Society · 2025
    Article
  13. Review
  14. Article
  15. Article
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  18. [Application of Polysomnography in Common Neurodegenerative Diseases].Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition · 2023
    Review
  19. Observational
  20. Article
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

8 authors at 1 institution in 1 country.

Shunjie LiuDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China.
Junhao PanDepartment of Psychology, Sun Yat-sen University, Guangzhou, 510006, China.
Ke TangDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China.
Qingfeng LeiDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China.
Lu HeDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China.
Yangyang MengDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China.
Xiaodong CaiDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China.
Zhong LiDepartment of Neurology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510655, China. lzhong@mail.sysu.edu.cn.ORCID http://orcid.org/0000-0002-5345-3359
Sun Yat-sen University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeSleep disturbances are common in Alzheimer's disease (AD) and mild cognitive impairment (MCI) patients. Non-rapid eye movement stage 3 (N3), rapid eye movement stage (REM), spindle density, and K-complex (KC) density are decreased in MCI and AD patients. Periodic limb movements in sleep (PLMS) are increased in other neurodegenerative diseases. We aimed to distinguish amnestic mild cognitive impairment (aMCI) patients from the overall population of MCI patients by comparing the N3 and REM proportions, the morphological characteristics of spindles and KCs and the periodic limb movement index (PLMI) among control, aMCI and AD subjects.

methodsIn 92 subjects (30 controls, 32 aMCI and 30 AD), sleep stages, spindles, KCs and PLMS were recorded during the second of two nights of polysomnography (PSG). We compared the above parameters among the three groups.

resultsAD and aMCI subjects had lower proportions of N3 and REM, poorer spindle and KC activities and more frequent PLMS than controls. These alterations were associated with decreased Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) scores. We determined cut-off values for distinguishing aMCI and AD using logistic regression and receiver operating characteristic (ROC) analyses.

conclusionsAD and aMCI patients have abnormal sleep stage proportions, spindles, KCs and PLMS. The combination of the above alterations may distinguish aMCI and AD patients from controls with high specificity and sensitivity.

Indexed as

BiomarkersSleep StagesAgedAlzheimer DiseaseCognitive DysfunctionDisorders of Excessive SomnolenceElectroencephalographyHumansNeuropsychological TestsNocturnal Myoclonus SyndromePolysomnographySleep Apnea, ObstructiveBiomarkersAlzheimer’s diseaseAmnestic mild cognitive impairmentK-complexPeriodic limb movementsPolysomnographySleep spindleSleep stages

Identifiers

PMID31786748
OpenAlexW2991295865

What OpenQuestion holds

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Read underepoch 390

Registered trials

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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.