title: Abnormal regional homogeneity in patients with essential tremor revealed by resting-state functional MRI.
abstract: Essential tremor (ET) is one of the most common movement disorders in human adults. It can be characterized as a progressive neurological disorder of which the most recognizable feature is a tremor of the arms or hands that is apparent during voluntary movements such as eating and writing. The pathology of ET remains unclear. Resting-state fMRI (RS-fMRI), as a non-invasive imaging technique, was employed to investigate abnormalities of functional connectivity in ET in the brain. Regional homogeneity (ReHo) was used as a metric of RS-fMRI to assess the local functional connectivity abnormality in ET with 20 ET patients and 20 age- and gender-matched healthy controls (HC). The ET group showed decreased ReHo in the anterior and posterior bilateral cerebellar lobes, the bilateral thalamus and the insular lobe, and increased ReHo in the bilateral prefrontal and parietal cortices, the left primary motor cortex and left supplementary motor area. The abnormal ReHo value of ET patients in the bilateral anterior cerebellar lobes and the right posterior cerebellar lobe were negatively correlated with the tremor severity score, while positively correlated with that in the left primary motor cortex. These findings suggest that the abnormality in cerebello-thalamo-cortical motor pathway is involved in tremor generation and propagation, which may be related to motor-related symptoms in ET patients. Meanwhile, the abnormality in the prefrontal and parietal regions may be associated with non-motor symptoms in ET. These findings suggest that the ReHo could be utilized for investigations of functional-pathological mechanism of ET.
authors.affiliation: Department of Radiology, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Fang
authors.forename: Fajin
authors.initials: F
authors.lastname: Lv
authors.forename: Tianyou
authors.initials: T
authors.lastname: Luo
authors.forename: Oumei
authors.initials: O
authors.lastname: Cheng
authors.forename: Wei
authors.initials: W
authors.lastname: Liao
authors.forename: Ke
authors.initials: K
authors.lastname: Sheng
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wang
authors.forename: Fei
authors.initials: F
authors.lastname: Wu
authors.forename: Yida
authors.initials: Y
authors.lastname: Hu
authors.forename: Jing
authors.initials: J
authors.lastname: Luo
authors.forename: Qing X
authors.initials: QX
authors.lastname: Yang
authors.forename: Han
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000328:Adult; D001921:Brain / Q000473:pathology / Q000503:physiopathology*; D001931:Brain Mapping; D002531:Cerebellum / Q000473:pathology / Q000503:physiopathology; D020329:Essential Tremor / Q000473:pathology / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000473:pathology / Q000503:physiopathology