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Cai J, Xu M, Cai H, Jiang Y, Zheng X, Sun H, Sun Y, Sun Y. Task Cortical Connectivity Reveals Different Network Reorganizations between Mild Stroke Patients with Cortical and Subcortical Lesions. Brain Sci 2023; 13:1143. [PMID: 37626499 PMCID: PMC10452233 DOI: 10.3390/brainsci13081143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/24/2023] [Accepted: 07/27/2023] [Indexed: 08/27/2023] Open
Abstract
Accumulating efforts have been made to investigate cognitive impairment in stroke patients, but little has been focused on mild stroke. Research on the impact of mild stroke and different lesion locations on cognitive impairment is still limited. To investigate the underlying mechanisms of cognitive dysfunction in mild stroke at different lesion locations, electroencephalograms (EEGs) were recorded in three groups (40 patients with cortical stroke (CS), 40 patients with subcortical stroke (SS), and 40 healthy controls (HC)) during a visual oddball task. Power envelope connectivity (PEC) was constructed based on EEG source signals, followed by graph theory analysis to quantitatively assess functional brain network properties. A classification framework was further applied to explore the feasibility of PEC in the identification of mild stroke. The results showed worse behavioral performance in the patient groups, and PECs with significant differences among three groups showed complex distribution patterns in frequency bands and the cortex. In the delta band, the global efficiency was significantly higher in HC than in CS (p = 0.011), while local efficiency was significantly increased in SS than in CS (p = 0.038). In the beta band, the small-worldness was significantly increased in HC compared to CS (p = 0.004). Moreover, the satisfactory classification results (76.25% in HC vs. CS, and 80.00% in HC vs. SS) validate the potential of PECs as a biomarker in the detection of mild stroke. Our findings offer some new quantitative insights into the complex mechanisms of cognitive impairment in mild stroke at different lesion locations, which may facilitate post-stroke cognitive rehabilitation.
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Affiliation(s)
- Jiaye Cai
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China; (J.C.); (H.C.); (Y.J.); (X.Z.); (Y.S.)
| | - Mengru Xu
- Key Laboratory for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Huaying Cai
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China; (J.C.); (H.C.); (Y.J.); (X.Z.); (Y.S.)
| | - Yun Jiang
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China; (J.C.); (H.C.); (Y.J.); (X.Z.); (Y.S.)
| | - Xu Zheng
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China; (J.C.); (H.C.); (Y.J.); (X.Z.); (Y.S.)
| | - Hongru Sun
- Department of Electrocardiogram, Dongyang Traditional Chinese Medicine Hospital, Dongyang 322100, China;
| | - Yu Sun
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China; (J.C.); (H.C.); (Y.J.); (X.Z.); (Y.S.)
- Key Laboratory for Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China
- MOE Frontiers Science Center for Brain Science and Brain-Machine Integration, Zhejiang University, Hangzhou 310058, China
- State Key Laboratory for Brain-Computer Intelligence, Zhejiang University, Hangzhou 310016, China
| | - Yi Sun
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China; (J.C.); (H.C.); (Y.J.); (X.Z.); (Y.S.)
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Shahouzaie N, Farzadfar MT, Jamali J, Sobhani-Rad D. The impact of subcortical stroke-related aphasia on executive functions and working memory. APPLIED NEUROPSYCHOLOGY. ADULT 2023:1-7. [PMID: 36745708 DOI: 10.1080/23279095.2023.2174437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Aphasia is a common post-stroke disorder characterized by impairments in speaking, listening, reading, and writing. Although cognitive impairments have been well studied in cortical aphasia, deficits associated with subcortical aphasia remain to be elucidated. The current study aimed to assess executive functions (EF) and working memory (WM) in patients with subcortical aphasia, and investigate the relationship between language abilities and cognition deficits. Participants of this research included patients with thalamus lesions (n = 9; mean age = 53.89 years) and healthy individuals (n = 9; mean age = 54.33 years). Assessment materials were the Mini-Mental State Examination (MMSE), Persian Western Aphasia Battery (P-WAB-1), digit span subtest of Adult Wechsler Test (WAIS-R), and Wisconsin Card Sorting Test (WCST). Obtained results revealed significant differences in all components of EF, as well as in WM forward and backward digit spans between patients and healthy individuals. However, investigating the relationship between MMSE and AQ scores and components of EF and WM revealed no significant difference. In conclusion, the findings of the present research indicated defects in cognitive functions, including WM and EF, in patients with subcortical stroke. Accordingly, it is crucial to provide optimal rehabilitation therapies for the improvement of language and cognitive problems upon subcortical aphasia.
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Affiliation(s)
- Nasrin Shahouzaie
- Department of Speech Therapy, School of Rehabilitation, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Mohammad Taghi Farzadfar
- Department of Neurology, Mashhad University of Medical Sciences, Ghaem Medical Center, Mashhad, Iran
| | - Jamshid Jamali
- Department of Biostatistics, School of Health, Social Determinants of Health Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Davood Sobhani-Rad
- Department of Speech Therapy, School of Paramedical and Rehabilitation Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
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Liu G, Tan X, Dang C, Tan S, Xing S, Huang N, Peng K, Xie C, Tang X, Zeng J. Regional Shape Abnormalities in Thalamus and Verbal Memory Impairment After Subcortical Infarction. Neurorehabil Neural Repair 2019; 33:476-485. [PMID: 31081462 DOI: 10.1177/1545968319846121] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background. Subcortical infarcts can result in verbal memory impairment, but the potential underlying mechanisms remain unknown. Objective. We investigated the spatiotemporal deterioration patterns of brain structures in patients with subcortical infarction and identified the regions that contributed to verbal memory impairment. Methods. Cognitive assessment and structural magnetic resonance imaging were performed 1, 4, and 12 weeks after stroke onset in 28 left-hemisphere and 22 right-hemisphere stroke patients with subcortical infarction. Whole-brain volumetric analysis combined with a further-refined shape analysis was conducted to analyze longitudinal morphometric changes in brain structures and their relationship to verbal memory performance. Results. Between weeks 1 and 12, significant volume decreases in the ipsilesional basal ganglia, inferior white matter, and thalamus were found in the left-hemisphere stroke group. Among those 3 structures, only the change rate of the thalamus volume was significantly correlated with that in immediate recall. For the right-hemisphere stroke group, only the ipsilesional basal ganglia survived the week 1 to week 12 group comparison, but its change rate was not significantly correlated with the verbal memory change rate. Shape analysis of the thalamus revealed atrophies of the ipsilesional thalamic subregions connected to the prefrontal, temporal, and premotor cortices in the left-hemisphere stroke group and positive correlations between the rates of those atrophies and the change rate in immediate recall. Conclusions. Secondary damage to the thalamus, especially to the left subregions connected to specific cortices, may be associated with early verbal memory impairment following an acute subcortical infarct.
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Affiliation(s)
- Gang Liu
- 1 The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Xiaoqing Tan
- 2 Southern University of Science and Technology, Shenzhen, Guangdong, China.,3 Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Chao Dang
- 1 The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Shuangquan Tan
- 1 The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Shihui Xing
- 1 The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Nianwei Huang
- 2 Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Kangqiang Peng
- 4 Sun Yat-Sen University Cancer Center, Guangzhou, Guangdong, China
| | - Chuanmiao Xie
- 4 Sun Yat-Sen University Cancer Center, Guangzhou, Guangdong, China
| | - Xiaoying Tang
- 2 Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Jinsheng Zeng
- 1 The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China
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Schouten EA, Schiemanck SK, Brand N, Post MW. Long-Term Deficits in Episodic Memory after Ischemic Stroke: Evaluation and Prediction of Verbal and Visual Memory Performance Based on Lesion Characteristics. J Stroke Cerebrovasc Dis 2009; 18:128-38. [DOI: 10.1016/j.jstrokecerebrovasdis.2008.09.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 09/11/2008] [Accepted: 09/12/2008] [Indexed: 11/28/2022] Open
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Lange G, Waked W, Kirshblum S, DeLuca J. Organizational strategy influence on visual memory performance after stroke: cortical/subcortical and left/right hemisphere contrasts. Arch Phys Med Rehabil 2000; 81:89-94. [PMID: 10638882 DOI: 10.1016/s0003-9993(00)90227-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To examine how organizational strategy at encoding influences visual memory performance in stroke patients. DESIGN Case control study. SETTING Postacute rehabilitation hospital. PARTICIPANTS Stroke patients with right hemisphere damage (n = 20) versus left hemisphere damage (n = 15), and stroke patients with cortical damage (n = 11) versus subcortical damage (n = 19). MAIN OUTCOME MEASURES Organizational strategy scores, recall performance on the Rey-Osterrieth Complex Figure (ROCF). RESULTS Results demonstrated significantly greater organizational impairment and less accurate copy performance (i.e., encoding of visuospatial information on the ROCF) in the right compared to the left hemisphere group, and in the cortical relative to the subcortical group. Organizational strategy and copy accuracy scores were significantly related to each other. The absolute amount of immediate and delayed recall was significantly associated with poor organizational strategy scores. However, relative to the amount of visual information originally encoded, memory performances did not differ between groups. CONCLUSIONS These findings suggest that visual memory impairments after stroke may be caused by a lack of organizational strategy affecting information encoding, rather than an impairment in memory storage or retrieval.
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Affiliation(s)
- G Lange
- Department of Psychiatry, University of Medicine and Dentistry of New Jersey-New Jersey Medical School, Newark, USA
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