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Resting-state functional connectivity abnormalities correlate with psychometric hepatic encephalopathy score in cirrhosis.

Abstract：

BACKGROUND & AIMS:Neurocognitive impairment is a common complication of cirrhosis and regarded as the important characteristic for early stage of hepatic encephalopathy (HE). This study aimed to investigate the changes in brain network centrality of functional connectivity among cirrhotic patients and uncover the mechanisms about early HE. METHODS:Twenty-four cirrhotic patients without overt HE and 21 healthy controls were enrolled and underwent resting-state fMRI and Psychometric Hepatic Encephalopathy Score (PHES) tests. Whole-brain functional network was constructed by measuring the temporal correlations of every pairs of brain gray matter voxels; and then voxel-wise degree centrality (DC), an index reflecting importance of a node in functional integration, was calculated and compared between two groups. A seed-based resting-state functional connectivity (RSFC) analysis was further performed to investigate abnormal functional connectivity pattern of those regions with changed DC. RESULTS:Compared with controls, the cirrhotic patients had worse performances in all neurocognitive tests and lower PHES score. Meanwhile, patients showed decreased DC in bilateral medial prefrontal gyrus and anterior cingulate cortex, left middle frontal gyrus, and bilateral thalamus; while increased DC in right middle occipital gyrus and parahippocampal gyrus/inferior temporal gyrus. The seed-based RSFC analyses revealed that the relevant functional networks, such as default-mode and attention networks, visual network, and thalamo-cortical circuits, were disturbed in cirrhotic patients. The DC changes were correlated with PHES score in patient group. CONCLUSIONS:Our findings further confirm brain network disorganization in cirrhotic patients with neurocognitive impairments and may provide a new perspective for understanding HE-related mechanisms.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Chen HJ,Jiang LF,Sun T,Liu J,Chen QF,Shi HB

doi

10.1016/j.ejrad.2015.08.005

subject

Has Abstract

pub_date

2015-11-01 00:00:00

pages

2287-95

issue

11

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(15)30078-4

journal_volume

84

pub_type

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