Evidence map›Paper›PMID 32535681›Full record

ArticleJournal of neurology2020

Identifying subtypes of mild cognitive impairment in Parkinson's disease using cluster analysis.

Dana Pourzinal, Ji Hyun J Yang, Gerard J Byrne, John D O'Sullivan, Leander Mitchell, Katie L McMahon, David A Copland, Nadeeka N Dissanayaka

Abstract read
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In one paragraph

Article in Journal of neurology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed, 1 pooled it
–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

21 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  7. Cognitive profiles at presentation and subsequent cognitive decline and quality of life in Parkinson's disease.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025
    Article
  8. A predictive model for longitudinal cognitive subtypes in Parkinson's disease.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2025
    Article
  9. Article
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  11. Anticholinergic Medication Burden and Cognitive Subtypes in Parkinson's Disease without Dementia.Archives of clinical neuropsychology : the official journal of the National Academy of Neuropsychologists · 2024
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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

8 authors.

Dana PourzinalUQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane and Women's Hospital, Building 71/918, Herston, Brisbane, QLD, 4029, Australia.
Ji Hyun J YangUQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane and Women's Hospital, Building 71/918, Herston, Brisbane, QLD, 4029, Australia.
Gerard J ByrneUQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane and Women's Hospital, Building 71/918, Herston, Brisbane, QLD, 4029, Australia.
John D O'SullivanUQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane and Women's Hospital, Building 71/918, Herston, Brisbane, QLD, 4029, Australia.
Leander MitchellSchool of Psychology, The University of Queensland, St Lucia, Brisbane, QLD, 4067, Australia.
Katie L McMahonSchool of Clinical Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD, 4000, Australia.
David A CoplandUQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane and Women's Hospital, Building 71/918, Herston, Brisbane, QLD, 4029, Australia.
Nadeeka N DissanayakaUQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane and Women's Hospital, Building 71/918, Herston, Brisbane, QLD, 4029, Australia. n.dissanayaka@uq.edu.au.ORCID http://orcid.org/0000-0002-0164-3337

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionThe concept of Mild Cognitive Impairment (MCI) in Parkinson's disease (PD) has shown the potential for identifying at-risk dementia patients. Identifying subtypes of MCI is likely to assist therapeutic discoveries and better clinical management of patients with PD (PWP). Recent cluster-based approaches have demonstrated dominance in memory and executive impairment in PD. The present study will further explore the role of memory and executive impairment and associated clinical features in non-demented PWP.

methodA K-means cluster analysis was performed on ten "frontal" and "posterior" cognitive variables derived from a dataset of 85 non-demented PWP. The resulting cluster structure was chosen based on quantitative, qualitative, theoretical, and clinical validity. Cluster profiles were then created through statistical analysis of cognitive and clinical/demographic variables. A descriptive analysis of each cluster's performance on a comprehensive PD-MCI diagnostic battery was also explored.

resultsThe resulting cluster structure revealed four distinct cognitive phenotypes: (1) frontal-dominant impairment; (2) posterior-cortical-dominant impairment; (3) global impairment, and (4) cognitively intact. Demographic profiling revealed significant differences in the age, gender split, global cognitive ability, and motor symptoms between these clusters. However, there were no significant differences between the clusters on measures of depression, apathy, and anxiety.

conclusionThese results validate the existence of distinct cognitive phenotypes within PD-MCI and encourage future research into their clinical trajectory and neuroimaging correlates.

Indexed as

Cognitive DysfunctionParkinson DiseaseCluster AnalysisHumansNeuroimagingNeuropsychological TestsCluster analysisMild cognitive impairmentParkinson’s disease

Identifiers

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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.