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Title: Hierarchical cluster analysis of multimodal imaging data identifies brain atrophy and cognitive patterns in Parkinson's disease
Author: Inguanzo, Anna
Sala Llonch, Roser
Segura i Fàbregas, Bàrbara
Erostarbe, H.
Abós, Alexandra
Campabadal, Anna
Uribe, Carme
Baggio, Hugo César
Compta, Yaroslau
Martí Domènech, Ma. Josep
Valldeoriola Serra, Francesc
Bargalló Alabart, Núria​
Junqué i Plaja, Carme, 1955-
Keywords: Malaltia de Parkinson
Ressonància magnètica
Anàlisi de conglomerats
Parkinson's disease
Magnetic resonance
Cluster analysis
Issue Date: 12-Nov-2020
Publisher: Elsevier B.V.
Abstract: Background: Parkinson's disease (PD) is a heterogeneous condition. Cluster analysis based on cortical thickness has been used to define distinct patterns of brain atrophy in PD. However, the potential of other neuroimaging modalities, such as white matter (WM) fractional anisotropy (FA), which has also been demonstrated to be altered in PD, has not been investigated. Objective: We aim to characterize PD subtypes using a multimodal clustering approach based on cortical and subcortical gray matter (GM) volumes and FA measures. Methods: We included T1-weighted and diffusion-weighted MRI data from 62 PD patients and 33 healthy controls. We extracted mean GM volumes from 48 cortical and 17 subcortical regions using FSL-VBM, and the mean FA from 20 WM tracts using Tract-Based Spatial Statistics (TBSS). Hierarchical cluster analysis was performed with the PD sample using Ward's linkage method. Whole-brain voxel-wise intergroup comparisons of VBM and TBSS data were also performed using FSL. Neuropsychological and demographic statistical analyses were conducted using IBM SPSS Statistics 25.0. Results: We identified three PD subtypes, with prominent differences in GM patterns and little WM involvement. One group (n = 15) with widespread cortical and subcortical GM volume and WM FA reductions and pronounced cognitive deficits; a second group (n = 21) with only cortical atrophy limited to frontal and temporal regions and more specific neuropsychological impairment, and a third group (n = 26) without detectable atrophy or cognition impairment. Conclusion: Multimodal MRI data allows classifying PD patients into groups according to GM and WM patterns, which in turn are associated with the cognitive profile.
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It is part of: Parkinsonism & Related Disorders, 2020, vol. 82, p. 16-23
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ISSN: 1353-8020
Appears in Collections:Articles publicats en revistes (Medicina)
Articles publicats en revistes (IDIBAPS: Institut d'investigacions Biomèdiques August Pi i Sunyer)
Articles publicats en revistes (Biomedicina)
Articles publicats en revistes (Institut de Neurociències (UBNeuro))

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