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Alterations in regional homogeneity of resting-state brain activity in mesial temporal lobe epilepsy
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Alterations in regional homogeneity of resting-state brain activity in mesial temporal lobe epilepsy

Author: Hongwu Zeng Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Department of Radiology, Shenzhen Children's Hospital, Shenzhen, Guangdong, China; Ricardo Pizarro Affiliation: Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A; Veena A Nair Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Christian La Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Neurosciences Training Program, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A; Vivek Prabhakaran Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Neurosciences Training Program, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A
Edition/Format: Article Article : English
Publication:Epilepsia, v54 n4 (April 2013): 658-666
Other Databases: WorldCatWorldCat
Summary:
Purpose: The purpose of the present study was to identify abnormal areas of regional synchronization in patients with mesial temporal lobe epilepsy and hippocampus sclerosis (mTLE-HS) compared to healthy controls, by applying a relatively novel method, the Regional Homogeneity (ReHo) method to resting state fMRI (RS-fMRI) data.  Read more...
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Document Type: Article
All Authors / Contributors: Hongwu Zeng Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Department of Radiology, Shenzhen Children's Hospital, Shenzhen, Guangdong, China; Ricardo Pizarro Affiliation: Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A; Veena A Nair Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Christian La Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Neurosciences Training Program, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A; Vivek Prabhakaran Affiliation: Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, U.S.A; Neurosciences Training Program, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A
ISSN:0013-9580
Language Note: English
Unique Identifier: 5155454007
Notes: Address correspondence to Vivek Prabhakaran, Assistant Professor, Director of Functional Neuroimaging in Radiology, Department of Radiology, UW Health UW Hospital and Clinics, 600 Highland Avenue, Madison, WI 53792, U.S.A. E-mail: vprabhakaran@uwhealth.org
Awards:
Responsibility: H. Zeng et al.

Abstract:

Purpose: The purpose of the present study was to identify abnormal areas of regional synchronization in patients with mesial temporal lobe epilepsy and hippocampus sclerosis (mTLE-HS) compared to healthy controls, by applying a relatively novel method, the Regional Homogeneity (ReHo) method to resting state fMRI (RS-fMRI) data.
Methods: Eyes closed RS-fMRI data were acquired from 10 mTLE-HS patients (four right-side, six left-side) and 15 age- and gender-matched healthy subjects, and were analyzed by using ReHo. For group analysis, four right-side MTLE-HS patients' functional images were flipped, in order to make a homogeneous left MTLE-HS group (10 cases) and increase the sample size.
Key Findings: Compared to the healthy control group, patients showed significantly increased ReHo in ipsilateral parahippocampal gyrus, midbrain, insula, corpus callosum, bilateral sensorimotor cortex, and frontoparietal subcortical structures, whereas decreased ReHo was observed mainly in default mode network (DMN) (including precuneus and posterior cingulate gyrus, bilateral inferior lateral parietal, and mesial prefrontal cortex) and cerebellum in patients relative to the control group.
Significance: This study identified that ReHo pattern in mTLE-HS patients was altered compared to healthy controls. We consider decreased ReHo in DMN to be responsible for wide functional impairments in cognitive processes. We propose that the increased ReHo in specific regions may form a network that might be responsible for seizure genesis and propagation.

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  • epilepsy  (by 1 person)
  • fmri  (by 1 person)
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Methods: Eyes closed RS-fMRI data were acquired from 10 mTLE-HS patients (four right-side, six left-side) and 15 age- and gender-matched healthy subjects, and were analyzed by using ReHo. For group analysis, four right-side MTLE-HS patients' functional images were flipped, in order to make a homogeneous left MTLE-HS group (10 cases) and increase the sample size.
Key Findings: Compared to the healthy control group, patients showed significantly increased ReHo in ipsilateral parahippocampal gyrus, midbrain, insula, corpus callosum, bilateral sensorimotor cortex, and frontoparietal subcortical structures, whereas decreased ReHo was observed mainly in default mode network (DMN) (including precuneus and posterior cingulate gyrus, bilateral inferior lateral parietal, and mesial prefrontal cortex) and cerebellum in patients relative to the control group.
Significance: This study identified that ReHo pattern in mTLE-HS patients was altered compared to healthy controls. We consider decreased ReHo in DMN to be responsible for wide functional impairments in cognitive processes. We propose that the increased ReHo in specific regions may form a network that might be responsible for seizure genesis and propagation.
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