Reestablishing brain networks in patients without overt hepatic encephalopathy after liver transplantation

Wei Che Lin, Tun Wei Hsu, Chao Long Chen, Cheng Hsien Lu, Hsiu Ling Chen, Yu Fan Cheng*, Ching Po Lin

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

19 Scopus citations

Abstract

Cirrhotic patients without overt hepatic encephalopathy (HE) have associated with widespread neuro-psychological impairment. Liver transplantation can restore metabolic abnormalities but the mechanisms are unclear. We investigate brain functional networks after transplantation using resting-state funtional magnetic resonance imaging (MRI). Twenty-six cirrhotic patients without overt HE completed neuro-psychological assessment before and 6 to 12 months after transplantation, and compared with 35 healthy controls. Five major functional brain networks, default mode (DMN), dorsal attention (DAN), executive control (ECN), salience (SN), and primary networks (PN), were assessed. Nodal efficiency and strength in different functional networks were weighed and their interaction metrics displayed. Granger causal analysis between pretransplantation and posttransplantation was performed. Before transplantation, the intrafunctional connectivity was decreased in DMN, DAN, ECN, and SN. After transplantation, cognitive functions improved with increased functional connectivity. The interaction metrics among large-scale networks in patients became similar to healthy controls. The increase in PN affected the decrease in SN, while the increase in DAN forced a decrease in DMN. There was a bidirectional balance between DMN and SN. Dynamic disruptions and reconstruction in intrinsic large-scale networks are associated with parallel patterns of cognitive information processing deficits and recovery. Remapping of SN, DMN, and DAN is essential for restoring cognition after transplantation.

Original languageEnglish
Pages (from-to)1877-1886
Number of pages10
JournalJournal of Cerebral Blood Flow and Metabolism
Volume34
Issue number12
DOIs
StatePublished - 11 12 2014

Bibliographical note

Publisher Copyright:
© 2014 ISCBFM.

Keywords

  • MRI
  • cognition
  • functional connectivity
  • neuroplasticity
  • small world
  • topology

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