有先兆偏头痛患者发作间期的静息态功能磁共振变化

目的采用静息态功能磁共振成像技术探讨有先兆偏头痛患者的自发神经元活动,分析其脑功能网络的变化,以便更好地认识有先兆偏头痛的发病机制。方法对7例发作间期有先兆偏头痛患者和7例年龄、性别及受教育程度相匹配的健康对照行静息态功能磁共振成像扫描,分析原始数据,得出全脑低频振幅(ALFF),进行双样本t检验,并以ALFF差异脑区为感兴趣区(ROI)校正后行功能连接(FC)分析,比较两组之间影像学表现的差异。结果病例组双侧额上回、左侧眶额皮质低频振幅值显著高于对照组(t=2.18~5.12,P0.05)。病例组左侧颞中回、左侧颞下回、左侧尾状核、双侧丘脑、右侧运动前区低频振幅ALFF值显著低于对照组(t=-5.12~-2.18,P0.05);与对照组相比,病例组右侧眶额皮质、左侧额中回、双侧前扣带皮质、右侧缘上回与左侧额上回功能连接增强,病例组左侧小脑、右侧脑岛、脑干与左侧额上回之间的功能连接减弱。结论有先兆偏头痛患者头痛发作间期疼痛处理相关脑区功能异常,支持偏头痛并非单纯的发作性疾病。     

难治性癫痫患者楔前叶功能连接的静息态功能磁共振成像研究

目的应用静息态功能磁共振成像(rs-f MRI)探讨难治性癫痫患者楔前叶与全脑功能连接的改变及其意义。方法对23例难治性癫痫患者(癫痫组)及23名健康人(对照组)进行rs-f MRI检查,采集数据后采用功能连接的方法,分别计算以左侧楔前叶和右侧楔前叶为感兴趣区与全脑的功能连接,运用双样本t检验的统计学方法发现两组的显著性差异并进行分析。结果癫痫组左侧楔前叶与双侧顶下小叶、双侧岛叶、右侧缘上回、右侧额中回和双侧额下回的功能连接较对照组减弱(均P0.05);癫痫组左侧楔前叶与双侧海马旁回、双侧额上回、左侧后扣带回的功能连接较对照组增强(均P0.05)。癫痫组右侧楔前叶与左侧顶下小叶、右侧缘上回、右侧额中回、右侧额下回的功能连接较对照组减弱(均P0.05);癫痫组右侧楔前叶与双侧楔叶、左侧后扣带回的功能连接较对照组增强(均P0.05)。结论难治性癫痫患者静息状态下楔前叶与全脑的功能连接存在异常,"默认网络"功能的抑制可能是癫痫患者意识及认知等功能损害的重要原因。     

偏头痛患者基于体素形态学与功能连接分析

目的 探讨偏头痛患者脑结构、脑功能、认知和情绪的变化情况。方法 采集33例偏头痛患者(偏头痛组)及27例相匹配的健康对照者(健康对照组)的高分辨T₁结构相及静息态功能相数据,利用基于体素的形态学(VBM)方法分析偏头痛患者大脑灰质体积变化,继而利用静息态功能连接分析技术分析有结构变化的脑区与大脑其他区域功能连接的差异,结果采用GRF校正(体素水平P<0.001,簇水平P<0.05)。采用蒙特利尔认知评估量表(MoCA)及情绪量表[焦虑自评表(SAS)及抑郁自评量表(SDS)]评估偏头痛患者认知功能及焦虑、抑郁水平。分析偏头痛患者脑灰质体积变化与临床变量及量表评分的相关关系。结果 与健康对照组比较,偏头痛组SAS、SDS评分显著升高,MoCA评分显著降低(均P<0.05)。与健康对照组比较,偏头痛组左侧枕中回及左侧距状裂周围皮质灰质体积显著增大(GRF校正,体素水平P<0.001,簇水平P<0.05),偏头痛组左侧枕中回与多个脑区功能连接减弱,包括双侧脑岛、双侧颞上回、右侧缘上回、右侧中央后回、右侧额下回等脑区(GRF校正,体素水平P&...     

青少年广泛性焦虑障碍患者静息态功能磁共振成像研究

目的:运用局部一致性(ReHo)方法研究首发青少年广泛性焦虑障碍患者的局部自发性脑活动. 方法:对19例首发青少年广泛性焦虑障碍患者及14名年龄、性别与其相匹配的正常对照进行静息态脑功能磁共振成像扫描,通过计算每个给定体素与其最邻近的26个体素之间的肯德尔和谐系数(KCC)来获得全脑的局部一致性(ReHo)图,利用双样本t检验分析两组受试者静息态下局部一致性的差异. 结果:与正常对照相比,青少年广泛性焦虑障碍患者局部一致性降低的脑区包括双侧额中回、枕中回,左侧额上回、颞下回、前扣带回及右侧顶下回、枕下回(P ＜0.005,未校正);局部一致性增高的脑区包括:右侧楔前叶、角回及左侧枕上回(P ＜0.005,未校正). 结论:青少年广泛性焦虑障碍患者静息态脑功能局部一致性存在异常.     

焦虑症患者的静息态脑功能影像分析

目的 用静息态功能磁共振成像（rs-fMRI）探讨焦虑症患者脑功能的特点。方法 本研究对象为我院2020年1月～2022年1月40例焦虑症患者,设为观察组,另选择40名健康体检人员作为志愿者,设为对照组。采用3.0T MRI进行静息态fMRI成像,采用Matlab 2011b平台进行rsfMRI数据处理,比较两组ReHo值差异显著的脑区。评估焦虑症患者焦虑自评量表（SAS）,分析异常脑区ReHo值与SAS评分的相关性。结果 观察组左侧额上回、左侧额中回、右侧额下回、右侧楔前叶ReHo值显著高于对照组,右侧丘脑、右侧梭状回、右侧枕中回、左侧额中回显著低于对照组（P<0.05）;左侧额上回、右侧额下回、右侧楔前叶ReHo值与SAS评分呈正相关,右侧丘脑、右侧梭状回、右侧枕中回ReHo值与SAS评分呈负相关（P<0.05）。结论 焦虑症患者rs-fMRI存在多个脑区活动异常,右侧丘脑、左侧额上回等可能与焦虑症的发生及发展有所关联。     

~(18)F-FDG PET显像观察特发性快眼动睡眠期行为障碍患者脑葡萄糖代谢特点的研究

目的探讨~(18)F-FDG PET显像观察特发性快眼动睡眠期行为障碍(iRBD)患者脑葡萄糖代谢改变和iRBD脑葡萄糖代谢改变与病程间的相关性。方法纳入多导睡眠监测(PSG)确诊的iRBD患者20例(iRBD组)和年龄、性别匹配的健康对照者19例(对照组)。两组均行~(18)F-FDG PET脑显像。基于自动解剖标记模板将大脑划分为90个左右对称的脑区,计算各脑区葡萄糖代谢半定量值。对iRBD组和对照组各脑区葡萄糖代谢半定量值进行独立样本t检验;并对iRBD组脑葡萄糖代谢改变与病程行Pearson相关分析。结果 (1)与对照组比较,iRBD组的双侧背外侧额上回、双侧眶部额上回、双侧眶部额中回、双侧海马、双侧海马旁回、双侧杏仁核、左侧眶部额下回、左侧岛叶、左侧内侧与旁扣带脑回、左侧中央旁小叶、左侧苍白球的葡萄糖代谢半定量值均增高(P0.05);双侧距状裂周围皮质、双侧楔叶、双侧舌回、双侧枕上回、双侧枕中回、双侧枕下回、双侧角回、双侧颞上回、双侧颞中回、右侧颞横回的葡萄糖代谢半定量值均降低(P0.05)。Pearson相关分析结果,iRBD组双侧杏仁核、双侧颞上回、右侧楔叶、右侧枕上回、右侧颞横回、左侧海马、左侧颞中回的葡萄糖代谢半定量值与病程呈正相关(P0.05);而双侧眶部额上回、双侧眶部额中回、左侧中央旁小叶、左侧眶部额下回、左侧内侧和旁扣带回、右侧背外侧额上回、右侧海马旁回的葡萄糖代谢半定量值与病程呈负相关(P0.05)。结论 iRBD患者脑内存在疾病相关的葡萄糖代谢水平改变,有助于客观评估iRBD病情的变化。     

首次发病且未用药的成年早发和晚发抑郁症患者脑功能连接差异研究

目的比较成年早发抑郁症(EOD)和成年晚发抑郁症(LOD)患者默认网络(DMN)内部功能连接的差异,探究不同发病年龄的抑郁症患者是否有不同的发病机制。方法选取在昆明医科大学第一附属医院精神科门诊或住院的EOD患者(n=58)和LOD患者(n=62)为研究对象,同期招募年轻健康对照组(n=60)和年老健康对照组(n=52)。对受试者进行静息态功能磁共振扫描,选择左侧楔前叶为种子点,计算该种子点与全脑的功能连接,并比较各组间该种子点的功能连接差异。结果四组之间功能连接具有差异的脑区涉及双侧额叶、颞叶、基底节、枕叶、顶叶及小脑等脑区。EOD组左侧楔前叶与左侧小脑Crus1区、左侧小脑IX区、左侧颞中回、右侧楔前叶、右侧前扣带回、右侧额中回、右侧角回、右侧脑岛、右侧内侧额上回、右侧颞中回的功能连接均高于年轻健康对照组(Z=3. 752 4～5. 867 8,P均0. 05);而左侧楔前叶与左侧额中回、左侧中央旁小叶、右侧缘上回、右侧额上回、右侧颞下回、右侧中央后回、右侧中央前回、右侧枕上回的功能连接均低于年轻健康对照组(Z=-5. 007 6～-3. 797 7,P均0. 05)。LOD组左侧楔前叶与左侧小脑Crus2区、左侧尾状核、左侧颞下回、左侧小脑Crus1区、左侧角回、左侧额中回、右侧额中回、右侧角回、右侧眶额部额中回的功能连接均高于年老健康对照组(Z=4. 122 8～6. 579 4,P均0. 05);与左侧海马旁回、左侧额上回、右侧枕中回、右侧中央前回、右侧内侧额上回、右侧锯状回、右侧颞下回、右侧中央旁小叶、右侧梭状回、右侧后扣带回的功能连接均低于年老健康对照组(Z=-5. 884 0～-3. 617 2,P均0. 05)。EOD组左侧楔前叶与左侧锯状回、左侧小脑IV-VI区、左侧小脑Crus2区的功能连接比LOD组高(Z=4. 087 7、3. 937 4、3. 672 1,P均0. 05);EOD组左侧楔前叶与右侧额中回、右侧眶额部额下回、右侧额上回的功能连接比LOD组低(Z=-4. 274 8、-3. 956 8、-4. 724 3、-3. 663 2,P均0. 05)。结论 DMN内部功能连接增高及额顶网络功能连接降低可能与EOD的发病机制相关,而DMN前部功能连接增高和后部功能连接降低可能与LOD的发病机制相关,不同发病年龄的成年抑郁症患者可能有不同的发病机制。     

复发性视神经炎静息态低频振幅功能磁共振成像研究

目的研究复发性视神经炎患者异常神经功能活动脑区的分布差异,探讨基线神经功能及其与临床的关系。方法采用基于低频振幅(ALFF)的静息态f MRI技术对35例复发性视神经炎患者进行研究,并与50例性别、年龄和受教育程度相匹配的正常对照者进行比较,并分析m ALFF值改变脑区与病程、同步听觉系列加法测验(PASAT)评分和视力之间的相关性。结果与正常对照组相比,复发性视神经炎组患者左侧楔叶/楔前叶、左侧颞上回、双侧颞下回、双侧舌回和右侧枕中回m ALFF值降低(P0.01),而双侧额下回和左侧额叶内侧回m ALFF值增加(P0.01)。复发性视神经炎患者仅左侧颞上回(r=0.403,P0.05)和右侧舌回(r=0.472,P0.05)m ALFF值与病程呈正相关。结论静息态f MRI可以检出复发性视神经炎患者参与视觉信息处理的颞枕叶神经功能降低,以及与脑默认网络相关的额叶神经功能增强,为早期评价视神经炎患者神经功能和预测预后提供客观依据。     

右侧颞叶癫痫的静息态大脑熵改变及与警觉的关系

目的应用静息态功能磁共振成像研究右侧颞叶癫痫(right temploal lobe epilepsy,r TLE)患者大脑熵的改变及其与警觉功能的关系。方法利用注意网络测试(attention network test,ANT)对20名r TLE患者和22名健康对照者的警觉功能进行研究;同时计算两组被试静息态功能磁共振(resting-state functional magnetic resonance,rs-f MRI)下的大脑熵(Brain Entropy,BEN),并选取两组的差异脑区(P0.01)作为感兴趣区(region of interesting,ROI),提取熵值和各区的部分各向异性指数(fractional anisotropy,FA)值;分别对大脑熵值、FA值和警觉功能之间关系进行研究。结果与正常人相比,r TLE患者的固有警觉和位相性警觉反应时间显著增加;大脑熵在右颞下回、左额上回眶部显著增加,在右侧楔前叶、左侧顶上小叶等脑区显著降低;左额上回眶部的FA值较正常对照显著减小;固有警觉反应时间与左额上回眶部熵值呈正相关,与右侧楔前叶、左中央后回熵值呈负相关;位相性警觉反应时间与左额上回眶部的FA值、右侧楔前叶熵值及左中央后回熵值呈负相关。结论 r TLE患者警觉功能的下降与某些脑区其静息态大脑熵的改变和局部细微结构的损害有关,BEN作为一个新的指标可以用来研究癫痫患者脑功能。     

单相和双相抑郁障碍患者前扣带回功能连接特征差异观察北大核心CSCD

目的比较单、双相抑郁障碍前扣带回功能连接的差异,探讨前扣带回功能连接与抑郁症状严重程度的关系。方法利用fMRI技术,对符合DSM-Ⅳ诊断标准的30例单相抑郁障碍(unipolar depression)患者(单相抑郁组)、30例双相抑郁障碍(bipolar depression)患者(双相抑郁组)及年龄、性别、受教育程度相匹配的32名对照者(对照组)进行静息态fMRI扫描,以前扣带回为感兴趣区进行功能连接分析,比较组间差异,并对功能连接强度与抑郁症状的严重程度之间的关联进行Pearson相关分析。结果(1)与对照组相比,单相抑郁组左侧前扣带回与左侧三角部额下回(t=3.48)、左侧顶下缘角回(t=3.15)之间的功能连接增强,右侧前扣带回与左侧三角部额下回(t=3.52)之间的功能连接增强;(2)与对照组相比,双相抑郁组左侧前扣带回与右侧颞中回(t=-4.00)之间的功能连接减低,右侧前扣带回与左侧中央后回(t=-3.46)、右侧颞上回(t=-2.86)、右侧颞中回(t=-3.40)之间的功能连接减低;(3)与双相抑郁组相比,单相抑郁组左侧前扣带回与左侧三角部额下回(t=3.58)、右侧三角部额下回(t=4.06)、右侧颞中回(t=3.25)、左侧顶下缘角回(t=3.27)、右侧顶下缘角回(t=3.99)之间的功能连接增强;右侧前扣带回与左侧三角部额下回(t=3.13)、左侧顶下缘角回(t=3.42)、右侧顶下缘角回(t=3.78)之间的功能连接增强(均采用Alphasim校正,P<0.001);(4)Pearson相关分析显示,以上差异脑区功能连接强度与HAMD17总分均无相关性(-0.20.05)。结论静息态下单相抑郁患者前扣带回功能连接增强,双相抑郁患者前扣带回功能连接减弱;单、双相抑郁障碍差异脑区功能连接强度与临床症状无相关性。     

男性偏执型精神分裂症患者静息态功能磁共振脑自发低频振幅的变化

目的:利用静息态功能性磁共振成像(fMRI)技术观察男性偏执型精神分裂症患者脑自发低频振幅(ALFF)的变化。方法:对36例男性偏执型精神分裂症患者(病例组)和19名年龄、利手、性别、受教育程度相匹配的健康者(对照组)进行静息态fMRI扫描;分析两组全脑各区域ALFF的差异。结果:与对照组比较,病例组双侧额中回、右颞中回、右顶下回、左中央前回ALFF明显减低;右颞上回、双侧颞下回、左枕下回ALFF明显增强(P均0.01)。结论:男性偏执型精神分裂症患者脑部广泛区域存在ALFF异常。     

Intrinsic brain abnormalities in irritable bowel syndrome and effect of anxiety and depression

This resting-state functional magnetic resonance imaging (rs-fMRI) study investigated intrinsic brain abnormalities in irritable bowel syndrome (IBS) and effect of anxiety and depression. Thirty IBS patients and 31 matched healthy controls underwent rs-fMRI scanning. Regional brain activity was evaluated by measuring the amplitude of low-frequency fluctuation (ALFF) and compared between IBS patients and healthy controls with a two-sample t-test. Areas with abnormal ALFF were further used as seeds in subsequent inter-regional functional connectivity (FC) analysis. Statistical analyses were also performed by including anxiety and depression as covariates to evaluate their effect. Compared to healthy controls, IBS patients showed decreased ALFF in several core default mode network regions (medial prefrontal cortex [MPFC], posterior cingulate cortex [PCC], bilateral inferior parietal cortices [IPC]), and in middle frontal cortex, right orbital part of the superior frontal gyrus (ORBsup), dorsal anterior cingulate cortex (dACC), and ventral anterior cingulated cortex (vACC), while they showed increased ALFF in bilateral posterior insula and cuneus. In addition, IBS patients revealed decreased inter-regional positive FC between MPFC and right ORBsup, between vACC and PCC, as well as decreased negative FC between MPFC and left posterior insula, while they showed increased negative FC between MPFC and cuneus. The inclusion of anxiety and depression as covariates abolished ALFF differences in dACC and vACC, but none of the FC differences. In conclusion: IBS patients had disturbed intrinsic brain function. High levels of anxiety and depression in IBS patients could account for their decreased intrinsic brain activity in regions (the ACC) involved in affective processing.     

Abnormal baseline brain activity in low-grade hepatic encephalopathy: a resting-state fMRI study

Resting-state functional magnetic resonance imaging (fMRI) has been used to detect the alterations of spontaneous neuronal activity in various neuropsychiatric diseases, but rarely in low-grade hepatic encephalopathy (HE), a common neuropsychiatric complication of liver cirrhosis. We conducted a resting-state fMRI in 19 healthy controls, 18 cirrhotic patients without HE, and 22 cirrhotic patients with low-grade HE. The amplitude of low-frequency fluctuations (ALFF) of fMRI signal was computed to measure the spontaneous neuronal activity. Several regions showing significant ALFF differences among three groups were the precuneus, occipital lobe, left frontal lobe and anterior/middle cingulate cortex, and left cerebellum posterior lobe. Compared to controls or patients without HE, patients with low-grade HE showed decreased ALFF in the precuneus and adjacent cuneus, visual cortex, and left cerebellum posterior lobe. Compared to controls, patients with low-grade HE showed higher ALFF in both cortical and subcortical regions, including the right middle cingulate gyrus, and left anterior/middle cingulate gyrus, inferior frontal gyrus, insula lobe, parahippocampal gyrus, middle temporal gyrus and lentiform nucleus; compared to patients without HE, patients with low-grade HE showed higher ALFF in the left medial frontal gyrus and anterior cingulate gyrus, bilateral superior frontal gyrus, and right middle frontal gyrus. Moreover, correlations between ALFF changes and poor neurocognitive performances were found in patients with low-grade HE. These results suggested the existence of aberrant brain activity at the baseline state in low-grade HE, which may be implicated in the neurological pathophysiology underlying HE.     

帕金森病伴冻结步态患者的静息态磁共振研究

目的 探讨帕金森病患者冻结步态与静息态脑功能成像之间的关系。方法 2021年9月-2022年9月于襄阳市第一人民医院就诊的28例伴有冻结步态的帕金森病患者以及32例不伴有冻结步态的帕金森病患者接受了全脑结构像和静息状态下的功能磁共振扫描,计算并比较2组全脑百分率振幅(Percent amplitude of fluctuation,PerAF)的差异,同时探寻2组被试者间差异脑区与大脑其他区域功能连接性(Functional connectivity,FC)的不同。结果 在静息状态下与非冻结组比较,冻结组双侧额中回的PerAF信号显著减低,同时冻结组快速动眼期(Rapid eye movement,REM)睡眠行为异常筛查量表得分分别与左侧额中回(r=0.436,P=0.020)和右侧额中回(r=0.453,P=0.015)的显著区域的PerAF信号均呈正相关。此外,右侧脑干与双侧额中回之间的功能连接性增加,且右侧脑干区域与脚桥核部分重合;同时左侧额上回与额中回之间的功能连接性显著增加,且两者之间的FC信号与新冻结步态问卷得分呈显著的负相关(r=-0.510,P=0.006)。结论 冻...     

Analysis of Altered Baseline Brain Activity in Drug-Naive Adult Patients with Social Anxiety Disorder Using Resting-State Functional MRI

Objective

We hypothesize that the amplitude of low-frequency fluctuations (ALFF) is involved in the altered regional baseline brain function in social anxiety disorder (SAD). The aim of the study was to analyze the altered baseline brain activity in drug-naive adult patients with SAD.

Methods

We investigated spontaneous and baseline brain activities by obtaining the resting-state functional magnetic resonance imaging data of 20 drug-naïve adult SAD patients and 19 healthy controls. Voxels were used to analyze the ALFF values using one- and two-sample t-tests. A post-hoc correlation of clinical symptoms was also performed.

Results

Our findings show decreased ALFF in the bilateral insula, left medial superior frontal gyrus, left precuneus, left middle temporal gyrus, right middle temporal pole, and left fusiform gyrus of the SAD group. The SAD patients exhibited significantly increased ALFF in the right inferior temporal gyrus, right middle temporal gyrus, bilateral middle occipital gyrus, orbital superior frontal gyrus, right fusiform gyrus, right medial superior frontal gyrus, and left parahippocampal gyrus. Moreover, the Liebowitz Social Anxiety Scale results for the SAD patients were positively correlated with the mean Z values of the right middle occipital and right inferior occipital but showed a negative correlation with the mean Z values of the right superior temporal gyrus and right medial superior frontal gyrus.

Conclusion

These results of the altered regional baseline brain function in SAD suggest that the regions with abnormal spontaneous activities are involved in the underlying pathophysiology of SAD patients.     

A multicentre study of motor functional connectivity changes in patients with multiple sclerosis

In this multicentre study involving eight European centres, we characterized the spatial pattern of functional connectivity (FC) in the sensorimotor network from 61 right-handed patients with multiple sclerosis (MS) and 74 age-matched healthy subjects assessed with the use of functional magnetic resonance imaging (fMRI) and a simple motor task of their right dominant hand. FC was investigated by using: (i) voxel-wise correlations between the left sensorimotor cortex (SMC) and any other area in the brain; and (ii) bivariate correlations between time series extracted from several regions of interest (ROIs) belonging to the sensorimotor network. Both healthy controls and MS patients had significant FC between the left SMC and several areas of the sensorimotor network, including the bilateral postcentral and precentral gyri, supplementary motor area, middle frontal gyri, insulae, secondary somatosensory cortices, thalami, and right cerebellum. Voxel-wise assessment of FC revealed increased connectivity between the left SMC and the right precentral gyrus, right middle frontal gyrus (MFG) and bilateral postcentral gyri in MS patients as compared with controls. ROI analysis also showed a widespread pattern of altered connectivity, characterized by increased FC between the right MFG, the left insula and the right inferior frontal gyrus in comparison with many regions of the sensorimotor network. These results provide further evidence for increased bihemispheric contributions to motor control in patients with MS relative to healthy controls. They further suggest that multicentre fMRI studies of FC changes are possible, and provide a potential imaging biomarker for use in experimental therapeutic studies directed at enhancing adaptive plasticity in the disease.     

Altered brain function in persistent postural perceptual dizziness: A study on resting state functional connectivity

This study used resting state functional magnetic resonance imaging (rsfMRI) to investigate whole brain networks in patients with persistent postural perceptual dizziness (PPPD). We compared rsfMRI data from 38 patients with PPPD and 38 healthy controls using whole brain and region of interest analyses. We examined correlations among connectivity and clinical variables and tested the ability of a machine learning algorithm to classify subjects using rsfMRI results. Patients with PPPD showed: (a) increased connectivity of subcallosal cortex with left superior lateral occipital cortex and left middle frontal gyrus, (b) decreased connectivity of left hippocampus with bilateral central opercular cortices, left posterior opercular cortex, right insular cortex and cerebellum, and (c) decreased connectivity between right nucleus accumbens and anterior left temporal fusiform cortex. After controlling for anxiety and depression as covariates, patients with PPPD still showed decreased connectivity between left hippocampus and right inferior frontal gyrus, bilateral temporal lobes, bilateral insular cortices, bilateral central opercular cortex, left parietal opercular cortex, bilateral occipital lobes and cerebellum (bilateral lobules VI and V, and left I–IV). Dizziness handicap, anxiety, and depression correlated with connectivity in clinically meaningful brain regions. The machine learning algorithm correctly classified patients and controls with a sensitivity of 78.4%, specificity of 76.9%, and area under the curve = 0.88 using 11 connectivity parameters. Patients with PPPD showed reduced connectivity among the areas involved in multisensory vestibular processing and spatial cognition, but increased connectivity in networks linking visual and emotional processing. Connectivity patterns may become an imaging biomarker of PPPD.     

卒中后失语语言和非语言认知功能相关的静息态功能磁共振成像研究

目的 本研究拟借助静息态功能磁共振成像（resting-state functional magnetic resonance imaging,rsfMRI ）,探讨卒中后失语（post-stroke aphasia,PSA）患者语言及非语言认知功能特征及其相关的脑功 能变化情况。 方法 选择2019年3月-2020年1月连续就诊于首都医科大学附属北京天坛医院的PSA患者作为病例 组,筛选年龄、性别、受教育程度相匹配的健康志愿者作为健康对照（healthy controls,HCs）组。应 用西方失语成套测验（western aphasia battery,WAB）及洛文斯顿作业疗法认知评定（Loewenstein occupational therapy cognitive assessment,LOTCA）评估语言及非语言认知功能。应用rs-fMRI采集低 频振幅（amplitude of low frequency fluctuation,ALFF）及功能连接密度（functional connectivity density, FCD）等参数。比较两组影像学参数,并将其与WAB及LOTCA评分进行Pearson相关分析。 结果 本研究纳入16例PSA患者及17例HCs。与HCs组比较,PSA组双侧海马、海马旁回、颞下回等区 域ALFF值升高,左侧额下回岛盖部、岛叶等部位ALFF值降低;右侧海马、海马旁回的FCD值升高,左 侧顶下回、枕上回、枕中回、楔前叶等脑区FCD值降低。ALFF值与WAB及LOTCA评分的相关性分析显 示,左侧额下回岛盖部的ALFF值与WAB-失语商及流畅度得分呈正比（r =0.693,P =0.026;r =0.662, P =0.037）;左侧额下回岛盖部的ALFF值与LOTCA定向得分呈正比（r =0.642,P =0.045）,左侧海马的 ALFF值与LOTCA注意力及专注力评分呈正比（r =0.706,P =0.022）。 结论 PSA患者合并部分脑区局部自发活动的强度变化及脑区间的连通性改变,这些改变与PSA患 者语言障碍和非语言认知功能障碍密切相关,这些影像学改变可以作为PSA重要影像学标记。