Lookup NU author(s): Dr John-Paul Taylor
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Default mode network resting state activity in posterior cingulate cortex is abnormally reduced in Alzheimer disease (AD) patients. Fluctuating cognition and electroencephalogram abnormalities are established core and supportive elements respectively for the diagnosis of dementia with Lewy bodies (DLB). Our aim was to assess whether patients with DLB with both of these features have different default mode network patterns during resting state functional magnetic resonance imaging compared with AD. Eighteen patients with DLB, 18 AD patients without fluctuating cognition, and 15 control subjects were selected after appropriate matching and followed for 2–5 years to confirm diagnosis. Independent component analysis with functional connectivity (FC) and Granger causality approaches were applied to isolate and characterize resting state networks. FC was reduced in AD and DLB patients compared with control subjects. Posterior cingulate cortex activity was lower in AD than in control subjects and DLB patients (p < 0.05). Right hemisphere FC was reduced in DLB patients in comparison with control subjects but not in patients with AD, and was correlated with severity of fluctuations (ρ = −0.69; p < 0.01). Causal flow analysis showed differences between patients with DLB and AD and control subjects.
Author(s): Franciotti R, Falasca NW, Bonanni L, Anzellottia F, Maruottia V, Comania S, Thomas A, Tartaroa A, Taylor J-P, Onofrj M
Publication type: Article
Publication status: Published
Journal: Neurobiology of Ageing
Print publication date: 11/10/2012
ISSN (print): 0197-4580
ISSN (electronic): 1558-1497
Publisher: Elsevier Inc.
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