Altered structural connectivity networks in dementia with lewy bodies.
Nicolas NicastroElijah MakAjenthan SurendranathanTimothy RittmanJames B RoweJohn T O'BrienPublished in: Brain imaging and behavior (2021)
The impairment of large-scale brain networks has been observed in dementia with Lewy bodies (DLB) using functional connectivity, but the potential for an analogous effect on structural covariance patterns has not been determined. Twenty-four probable DLB subjects (mean age 74.3 ± 6.7 years, 16.7% female) and 23 similarly aged Controls were included. All participants underwent 3T MRI imaging with high-resolution T1-weighted magnetization-prepared rapid gradient echo (MPRAGE) sequence. Graph theoretical analyses were performed using variation in regional cortical thickness to construct a structural association matrix with pairwise Pearson correlations. Global and nodal graph parameters were computed to assess between-group differences and community structure was studied in order to quantify large-scale brain networks in both groups. In comparison to Controls, DLB subjects had decreased global efficiency, clustering, modularity and small-worldness of structural networks (all p < 0.05). Nodal measures showed that DLB subjects also had decreased clustering in bilateral temporal regions and decreased closeness centrality in extensive areas including right middle frontal, left cingulate and bilateral occipital lobe (all false-discovery rate (FDR)-corrected q < 0.05). Whereas four distinct modules could be clearly identified in Controls, DLB showed extensively disorganized modules, including default-mode network and dorsal attentional network. Our results suggest a marked impairment in large-scale brain structural networks in DLB, mirroring functional connectivity networks disruption.
Keyphrases
- functional connectivity
- resting state
- high resolution
- mild cognitive impairment
- contrast enhanced
- magnetic resonance imaging
- lymph node
- spinal cord
- magnetic resonance
- white matter
- parkinson disease
- working memory
- diffusion weighted imaging
- high throughput
- squamous cell carcinoma
- rna seq
- mass spectrometry
- neoadjuvant chemotherapy
- single cell
- spinal cord injury
- deep learning
- brain injury
- sensitive detection
- blood brain barrier
- solid state
- subarachnoid hemorrhage