Regional homogeneity analysis of low-frequency blood oxygenation level-dependent signals from neighboring voxels enables the analysis of local neuronal synchrony. Both structural magnetic resonance imaging and resting...Regional homogeneity analysis of low-frequency blood oxygenation level-dependent signals from neighboring voxels enables the analysis of local neuronal synchrony. Both structural magnetic resonance imaging and resting-state functional magnetic resonance imaging scans were collected from nine Parkinson＇s disease patients with right resting tremor, and from eight age-matched normal controls. Regional homogeneity was compared between Parkinson＇s disease patients and controls. The results revealed that regional homogeneity was increased in several brain regions, including the right precuneus, right superior parietal gyrus, left anterior cingulate cortex, right middle frontal gyrus and right inferior frontal gyrus. Conversely, regional homogeneity was decreased in the cerebellar vermis in Parkinson＇s disease patients compared with healthy controls.展开更多
Background： The relationship between monosymptomatic resting tremor （mRT） and Parkinson＇s disease （PD） Iemains controversial. In this study, we aimed to assess tile function ofpresynaptic dopaminergic neurons in...Background： The relationship between monosymptomatic resting tremor （mRT） and Parkinson＇s disease （PD） Iemains controversial. In this study, we aimed to assess tile function ofpresynaptic dopaminergic neurons in patients with mRT by dopamine transporter positron emission tomography （DAT-PET） and to evaluate the utility of clinical features or electrophysioIogical studies in differential diagnosis. Methods： Thirty-three consecutive patients with toRT were enrolled prospectively. The Unified Parkinson＇s Disease Rating Scale and electromyography were tested before DAT-PET. Striatal asymmetry index （SAI） was calculated, and a normal DATPET was defined as a SAI of 〈15%. Scans without evidence of dopaminergic deficits （SWEDDs） were diagnosed in patients with a subsequent normal DAT-PET and structural magnetic resonance imaging. Results： Twenty-eight toRT patients with a significant reduction in uptake of DAT binding in the striatum were diagnosed with PD, while the remained 5 with a normal DAT-PET scan were SWEDDs. As for UPRDS, the dressing and hygiene score, walking m motor experiences of daily living （Part I1） and motor examination （Part Ill ） were significant different between two groups （P 〈 0.05 and P 〈 0.01, respectively）. Bilateral tremor was more frequent in the SWEDDs group （P 〈 0.05）. The frequency of resting tremor and the amplitude ofpostural tremor tend to be higher in the SWEDDs group （P = 0.08 and P= 0.05, respectively）. Conclusions： mRT is heterogeneous in presynaptic nigrostriatal dopaminergic degeneration, which can be determined by DAT-PET brain imaging. Clinical and electrophysiological features may provide clues to distinguish PD from SWEDDs.展开更多
基金the Science and Technology Planning Project of Guangdong Province, China, No. 2008B080703041
文摘Regional homogeneity analysis of low-frequency blood oxygenation level-dependent signals from neighboring voxels enables the analysis of local neuronal synchrony. Both structural magnetic resonance imaging and resting-state functional magnetic resonance imaging scans were collected from nine Parkinson＇s disease patients with right resting tremor, and from eight age-matched normal controls. Regional homogeneity was compared between Parkinson＇s disease patients and controls. The results revealed that regional homogeneity was increased in several brain regions, including the right precuneus, right superior parietal gyrus, left anterior cingulate cortex, right middle frontal gyrus and right inferior frontal gyrus. Conversely, regional homogeneity was decreased in the cerebellar vermis in Parkinson＇s disease patients compared with healthy controls.
文摘Background： The relationship between monosymptomatic resting tremor （mRT） and Parkinson＇s disease （PD） Iemains controversial. In this study, we aimed to assess tile function ofpresynaptic dopaminergic neurons in patients with mRT by dopamine transporter positron emission tomography （DAT-PET） and to evaluate the utility of clinical features or electrophysioIogical studies in differential diagnosis. Methods： Thirty-three consecutive patients with toRT were enrolled prospectively. The Unified Parkinson＇s Disease Rating Scale and electromyography were tested before DAT-PET. Striatal asymmetry index （SAI） was calculated, and a normal DATPET was defined as a SAI of 〈15%. Scans without evidence of dopaminergic deficits （SWEDDs） were diagnosed in patients with a subsequent normal DAT-PET and structural magnetic resonance imaging. Results： Twenty-eight toRT patients with a significant reduction in uptake of DAT binding in the striatum were diagnosed with PD, while the remained 5 with a normal DAT-PET scan were SWEDDs. As for UPRDS, the dressing and hygiene score, walking m motor experiences of daily living （Part I1） and motor examination （Part Ill ） were significant different between two groups （P 〈 0.05 and P 〈 0.01, respectively）. Bilateral tremor was more frequent in the SWEDDs group （P 〈 0.05）. The frequency of resting tremor and the amplitude ofpostural tremor tend to be higher in the SWEDDs group （P = 0.08 and P= 0.05, respectively）. Conclusions： mRT is heterogeneous in presynaptic nigrostriatal dopaminergic degeneration, which can be determined by DAT-PET brain imaging. Clinical and electrophysiological features may provide clues to distinguish PD from SWEDDs.
文摘目的旨在探索MR引导下聚焦超声(MR-guided focus ultrasound,MRgFUS)治疗药物难治性特发性震颤(essential tremor,ET)患者术后局部自发性脑活动的长期纵向变化及与临床震颤评分的相关性。材料与方法前瞻性纳入于2019年1月至2019年5月在中国人民解放军总医院接受MRgFUS丘脑消融术的药物难治性ET患者(ET组)及年龄和性别匹配的健康对照(helathy controls,HC)组各9例,收集ET组基线、MRgFUS术后6个月及MRgFUS术后2年静息态功能磁共振成像(resting state functional magnetic resonance imaging,rs-fMRI)数据和临床震颤评定量表(Clinical Rating Scale for Tremor,CRST)以及HC组rs-fMRI数据。采用基于MATLAB平台的REST plus v1.2工具包中局部一致性(regional homogeneity,ReHo)方法,基于全脑体素配对样本t检验确定ET组基线与MRgFUS术后2年显著差异性脑区,使用DPABI v5.1工具包提取HC组及ET组该显著差异性脑区ReHo值。利用两独立样本t检验比较HC组与ET组该显著差异性脑区自发性和同步性脑活动,采用单因素重复测量方差分析比较ET组基线、MRgFUS术后6个月和MRgFUS术后2年该显著差异性脑区自发性和同步性脑活动。利用Spearman相关性分析对ET组术后临床震颤改善与ET组ReHo值改变之间的变化趋势进行相关性分析;利用Pearson相关性分析对ET组MRgFUS术后2年震颤改善率与ET组基线ReHo值进行相关性分析。结果ET组基线与MRgFUS术后2年显著差异性脑区位于右侧中央后回;与HC组比较,ET组基线右侧中央后回ReHo值显著减低(P<0.01),ET组MRgFUS术后两年右侧中央后回差异无统计学意义(P>0.05);ET组基线、MRgFUS术后6个月、MRgFUS术后2年,右侧中央后回ReHo值升高(F=3.95,P<0.05)。术后临床震颤改善与ReHo值改变之间的变化趋势成正相关;ET组MRgFUS术后2年CRST-A改善率与ET组基线ReHo值呈负相关(r=-0.709,P=0.032)。结论MRgFUS治疗有助于药物难治性ET患者缓解震颤症状,MRgFUS治疗影响ET患者脑自发性及同步性脑功能活动,且ReHo值与临床震颤改善具有相关性,有助于为MRgFUS术后神经重塑的评估提供神经影像学依据。
