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Odano I, Maeyatsu F, Hosoya T, Asari M, Oba K, Taki Y. Diagnostic approach with Z-score mapping to reduce artifacts caused by cerebral atrophy in regional CBF assessment of mild cognitive impairment (MCI) and Alzheimer's disease by [ 99mTc]-ECD and SPECT. Jpn J Radiol 2024; 42:508-518. [PMID: 38351252 PMCID: PMC11056337 DOI: 10.1007/s11604-023-01526-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 12/21/2023] [Indexed: 04/30/2024]
Abstract
PURPOSE The aim of this study was to develop a novel approach that enhanced diagnostic accuracy in the diagnosis of mild cognitive impairment (MCI) and early Alzheimer's disease (AD) using cerebral perfusion SPECT by minimizing artifacts caused by cerebral atrophy. MATERIALS AND METHODS [99mTc]-ECD and SPECT studies were performed on 15 cognitively normal patients, 40 patients with MCI, and 16 patients with AD. SPECT images were compared using SPM. The atrophy correction method was incorporated to reduce artifacts through the MRI masking procedure. Regional Z-score, percent extent, and atrophy correction rate were obtained and compared. The Z-score mapping program was structured as a single package that ran semi-automatically. RESULTS The method significantly reduced regional Z-score in most regions, leading to improved estimates. The mean atrophy correction rate ranged from 10.4 to 12.0%. In MCI and AD, the convexities of the frontal and parietal lobes and the posterior medial cerebrum were particularly sensitive to cerebral atrophy, and the Z-scores were overestimated, whereas the posterior cingulate cortex and the cerebellum were less sensitive. The diagnostic accuracy for MCI increased from 67 to 69% and for AD from 78 to 82%. CONCLUSION The proposed approach provided more precise Z-scores with less over- or underestimation, artifacts, and improved diagnostic accuracy, being recommended for clinical studies.
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Affiliation(s)
- Ikuo Odano
- Department of Aging Research and Geriatric Medicine, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan.
- Department of Neurology and Radiology, Miyagi Kosei Association, Izumi Hospital, Sendai, Japan.
- Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medicine and Dental Sciences, Niigata, Japan.
- Department of Aging Research and Geriatric Medicine, Institute of Development, Aging and Cancer, Tohoku University, 4-1 Seiryo-cho, Aoba-ku, Sendai, 980-8575, Japan.
| | - Fumio Maeyatsu
- Department of Neurology and Radiology, Miyagi Kosei Association, Izumi Hospital, Sendai, Japan
| | - Tetsuo Hosoya
- Department of Software Development. Division of Quality, Safety Management and Regulatory Affairs, PDRadiopharma. Inc., Tokyo, Japan
| | - Mami Asari
- Department of Neurology and Radiology, Miyagi Kosei Association, Izumi Hospital, Sendai, Japan
| | - Kentaro Oba
- Department of Human Brain Science, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Yasuyuki Taki
- Department of Aging Research and Geriatric Medicine, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
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Rivas-Fernández MÁ, Lindín M, Zurrón M, Díaz F, Lojo-Seoane C, Pereiro AX, Galdo-Álvarez S. Neuroanatomical and neurocognitive changes associated with subjective cognitive decline. Front Med (Lausanne) 2023; 10:1094799. [PMID: 36817776 PMCID: PMC9932036 DOI: 10.3389/fmed.2023.1094799] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 01/17/2023] [Indexed: 02/05/2023] Open
Abstract
Introduction Subjective Cognitive Decline (SCD) can progress to mild cognitive impairment (MCI) and Alzheimer's disease (AD) dementia and thus may represent a preclinical stage of the AD continuum. However, evidence about structural changes observed in the brain during SCD remains inconsistent. Materials and methods This cross-sectional study aimed to evaluate, in subjects recruited from the CompAS project, neurocognitive and neurostructural differences between a group of forty-nine control subjects and forty-nine individuals who met the diagnostic criteria for SCD and exhibited high levels of subjective cognitive complaints (SCCs). Structural magnetic resonance imaging was used to compare neuroanatomical differences in brain volume and cortical thickness between both groups. Results Relative to the control group, the SCD group displayed structural changes involving frontal, parietal, and medial temporal lobe regions of critical importance in AD etiology and functionally related to several cognitive domains, including executive control, attention, memory, and language. Conclusion Despite the absence of clinical deficits, SCD may constitute a preclinical entity with a similar (although subtle) pattern of neuroanatomical changes to that observed in individuals with amnestic MCI or AD dementia.
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Affiliation(s)
- Miguel Ángel Rivas-Fernández
- Department of Clinical Psychology and Psychobiology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain,Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Mónica Lindín
- Department of Clinical Psychology and Psychobiology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain,Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Montserrat Zurrón
- Department of Clinical Psychology and Psychobiology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain,Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Fernando Díaz
- Department of Clinical Psychology and Psychobiology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain,Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Cristina Lojo-Seoane
- Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain,Department of Developmental and Educational Psychology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Arturo X. Pereiro
- Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain,Department of Developmental and Educational Psychology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Santiago Galdo-Álvarez
- Department of Clinical Psychology and Psychobiology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain,Cognitive Neuroscience Research Group, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain,*Correspondence: Santiago Galdo-Álvarez,
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3
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Structural imaging outcomes in subjective cognitive decline: Community vs. clinical-based samples. Exp Gerontol 2020; 145:111216. [PMID: 33340685 DOI: 10.1016/j.exger.2020.111216] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 11/13/2020] [Accepted: 12/05/2020] [Indexed: 11/21/2022]
Abstract
Subjective cognitive decline (SCD) has been proposed as a preclinical stage of Alzheimer's disease (AD). Neuroimaging studies have suggested early AD-like structural brain alterations in SCD subjects compared to healthy controls. However, there is substantial heterogeneity in the results, which might depend on whether SCD samples were drawn from the community or from memory clinics. Here we reviewed brain atrophy, assessed through structural magnetic resonance imaging, separately for SCD-community and clinic-based samples. SCD-community samples show a more consistent pattern of atrophy, involving the hippocampus and temporal and parietal cortices. Similarly, in SCD-clinic samples the temporo-parietal cortex showed early vulnerability, however these studies reported a more heterogeneous atrophy pattern. Overall, these studies suggest both commonalities and differences in brain atrophy patterns between SCD clinical and community samples. In SCD-community, the temporal cortex is involved, while SCD-clinical exhibited a more complex pattern of atrophy, which may be related to a more heterogeneous sample reporting neuropsychiatric symptoms along with preclinical AD.
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4
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Vannini P, Hanseeuw BJ, Gatchel JR, Sikkes SAM, Alzate D, Zuluaga Y, Moreno S, Mendez L, Baena A, Ospina-Lopera P, Tirado V, Henao E, Acosta-Baena N, Giraldo M, Lopera F, Quiroz YT. Trajectory of Unawareness of Memory Decline in Individuals With Autosomal Dominant Alzheimer Disease. JAMA Netw Open 2020; 3:e2027472. [PMID: 33263761 PMCID: PMC7711319 DOI: 10.1001/jamanetworkopen.2020.27472] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
IMPORTANCE Recent studies have suggested that unawareness, or anosognosia, of memory decline is present in predementia stages of Alzheimer disease (AD) and may serve as an early symptomatic indicator of AD. OBJECTIVE To investigate the evolution of anosognosia of memory decline in individuals who carry the PSEN1 E280A variant for autosomal dominant AD compared with family members who do not carry the variant. DESIGN, SETTING, AND PARTICIPANTS This cohort study investigated a total of 2379 members of a Colombian kindred with autosomal dominant AD who were part of the Alzheimer's Prevention Initiative Registry. Assessments were completed at the University of Antioquia, Colombia, with data collected between January 1, 2000, and July 31, 2019. MAIN OUTCOMES AND MEASURES Awareness of memory function was operationalized using the discrepancy between self-report and study partner report on a memory complaint scale. Linear mixed effects models were used to assess memory self-awareness over age separately in variant carriers and noncarriers. RESULTS This study included 396 variant carriers (mean [SD] age, 32.7 [11.9] years; 200 [50.5%] female), of whom 59 (14.9%) were cognitively impaired, and 1983 cognitively unimpaired noncarriers (mean [SD] age, 33.5 [12.5] years; 1129 [56.9%] female). The variant carriers demonstrated increased awareness until the mean (SD) age of 35.0 (2.0) years and had anosognosia at approximately 43 years of age, approximately 6 years before their estimated median age of dementia onset (49 years; 95% CI, 49-51 years). Cognitively unimpaired noncarriers reported more complaints than their study partners aged 20 and 60 years (10.1 points, P < .001). On the awareness index, a decrease with age (mean [SE] estimate, -0.04 [0.02] discrepant-points per years; t = -2.2; P = .03) in the noncarriers and in the variant carriers (mean [SE] estimate, -0.21 [0.04] discrepant-points per years; t = -5.1; P < .001) was observed. CONCLUSIONS AND RELEVANCE In this cohort study, increased participant complaints were observed in both groups, suggesting that increased awareness of memory function was common and nonspecific to AD in this cohort. In variant carriers, awareness of memory function decreased in the predementia stages, reaching anosognosia close to the age of mild cognitive impairment onset, providing support for the usefulness of awareness of memory decline.
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Affiliation(s)
- Patrizia Vannini
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts
- Department of Neurology, Massachusetts General Hospital, Boston
- Department of Neurology, Brigham and Women’s Hospital, Boston, Massachusetts
- Harvard Medical School, Boston, Massachusetts
- Department of Radiology, Harvard Medical School, Boston, Massachusetts
| | - Bernard J. Hanseeuw
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts
- Harvard Medical School, Boston, Massachusetts
- Department of Radiology, Harvard Medical School, Boston, Massachusetts
- Neurology Department, Cliniques Universitaires Saint-Luc, Brussels, Belgium
- Institute of Neuroscience, Université Catholique de Louvain, Brussels, Belgium
| | - Jennifer R. Gatchel
- Harvard Medical School, Boston, Massachusetts
- Department of Psychiatry, Massachusetts General Hospital, Boston
- Department of Psychiatry, McLean Hospital, Belmont, Massachusetts
| | - Sietske A. M. Sikkes
- Amsterdam University Medical Centers, Alzheimer Center Amsterdam, Amsterdam, the Netherlands
| | - Diana Alzate
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Yesica Zuluaga
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Sonia Moreno
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Luis Mendez
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Ana Baena
- Department of Psychiatry, Massachusetts General Hospital, Boston
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Paula Ospina-Lopera
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Victoria Tirado
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Eliana Henao
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
- Department of Radiology, Hospital Pablo Tobón, Uribe, Medellin, Colombia
| | - Natalia Acosta-Baena
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Margarita Giraldo
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Francisco Lopera
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Yakeel T. Quiroz
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts
- Department of Neurology, Massachusetts General Hospital, Boston
- Harvard Medical School, Boston, Massachusetts
- Department of Psychiatry, Massachusetts General Hospital, Boston
- Grupo de Neurociencias de Antioquia, School of Medicine, Universidad de Antioquia, Medellin, Colombia
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de Eulate RG, Goñi I, Galiano A, Vidorreta M, Recio M, Riverol M, Zubieta JL, Fernández-Seara MA. Reduced Cerebral Blood Flow in Mild Cognitive Impairment Assessed Using Phase-Contrast MRI. J Alzheimers Dis 2018; 58:585-595. [PMID: 28453476 DOI: 10.3233/jad-161222] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
There is increasing evidence of a vascular contribution to Alzheimer's disease (AD). In some cases, prior work suggests that chronic brain hypoperfusion could play a prime pathogenic role contributing to the accumulation of amyloid-β,while other studies favor the hypothesis that vascular dysfunction and amyloid pathology are independent, although synergistic, mechanisms contributing to cognitive impairment. Vascular dysfunction can be evaluated by assessing cerebral blood flow impairment. Phase contrast velocity mapping by MRI offers a non-invasive means of quantifying the total inflow of blood to the brain. This quantitative parameter could be a sensitive indicator of vascular disease at early stages of AD. In this work, phase contrast MRI was used to evaluate cerebral hemodynamics in patients with subjective memory complaints, amnestic mild cognitive impairment, and mild to moderate AD, and compare them with control subjects. Results showed that blood flow and velocity were decreased in the patients with cognitive dysfunction and the decrease correlated with the degree of cognitive impairment as assessed by means of neuropsychological tests. Total cerebral blood flow measurements were clearly reduced in AD patients, but more importantly appeared to be sensitive enough to distinguish between healthy subjects and those with mild cognitive impairment. A quantitative measurement of total brain blood flow could potentially predict vascular dysfunction and compromised brain perfusion in early stages of AD.
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Affiliation(s)
| | - Irene Goñi
- Department of Radiology, Clínica Universidad de Navarra, Pamplona, Spain.,Department of Biomedical Engineering, TECNUN Engineering School, University of Navarra, San Sebastián, Spain
| | - Alvaro Galiano
- Department of Radiology, Clínica Universidad de Navarra, Pamplona, Spain
| | - Marta Vidorreta
- Center for Functional Neuroimaging, Department of Neurology, University of Pennsylvania Medical Center, Philadelphia, PA, USA
| | - Miriam Recio
- Department of Neurology, Clínica Universidad de Navarra, Pamplona, Spain
| | - Mario Riverol
- Department of Neurology, Clínica Universidad de Navarra, Pamplona, Spain
| | - José L Zubieta
- Department of Radiology, Clínica Universidad de Navarra, Pamplona, Spain
| | - María A Fernández-Seara
- Department of Radiology, Clínica Universidad de Navarra, Pamplona, Spain.,Department of Biomedical Engineering, TECNUN Engineering School, University of Navarra, San Sebastián, Spain
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6
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Vannini P, Amariglio R, Hanseeuw B, Johnson KA, McLaren DG, Chhatwal J, Pascual-Leone A, Rentz D, Sperling RA. Memory self-awareness in the preclinical and prodromal stages of Alzheimer's disease. Neuropsychologia 2017; 99:343-349. [PMID: 28385579 PMCID: PMC5473166 DOI: 10.1016/j.neuropsychologia.2017.04.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 03/03/2017] [Accepted: 04/01/2017] [Indexed: 10/19/2022]
Abstract
While loss of insight of cognitive deficits, anosognosia, is a common symptom in Alzheimer's disease dementia, there is a lack of consensus regarding the presence of altered awareness of memory function in the preclinical and prodromal stages of the disease. Paradoxically, very early in the Alzheimer's disease process, individuals may experience heightened awareness of memory changes before any objective cognitive deficits can be detected, here referred to as hypernosognosia. In contrast, awareness of memory dysfunction shown by individuals with mild cognitive impairment (MCI) is very variable, ranging from marked concern to severe lack of insight. This study aims at improving our mechanistic understanding of how alterations in memory self-awareness are related to pathological changes in clinically normal (CN) adults and MCI patients. 297 CN and MCI patients underwent PiB-PET (Positron Emission Tomography using Pittsburgh Compound B) in vivo amyloid imaging. Amyloid burden was estimated from Alzheimer's disease vulnerable regions, including the frontal, lateral parietal and lateral temporal, and retrosplenial cortex. Memory self-awareness was assessed using discrepancy scores between subjective and objective measures of memory function. A set of univariate analysis of variance were performed to assess the relationship between self-awareness of memory and amyloid pathology. Whereas CN individuals harboring amyloid pathology demonstrated hypernosognosia, MCI patients with increased amyloid pathology demonstrated anosognosia. In contrast, MCI patients with low amounts of amyloid were observed to have normal insight into their memory functions. Altered self-awareness of memory tracks with amyloid pathology. The findings of variability of awareness may have important implications for the reliability of self-report of dysfunction across the spectrum of preclinical and prodromal Alzheimer's disease.
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Affiliation(s)
- Patrizia Vannini
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
| | - Rebecca Amariglio
- Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Bernard Hanseeuw
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Radiology, Division of Molecular Imaging and Nuclear Medicine, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Neurology, Cliniques Universitaires Saint-Luc, Institute of Neurosciences, Université Catholique de Louvain, 10 Av. Hippocrate, 1200 Brussels, Belgium
| | - Keith A Johnson
- Department of Radiology, Division of Molecular Imaging and Nuclear Medicine, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA
| | - Donald G McLaren
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA; Biospective, Inc., Montreal, Canada
| | - Jasmeer Chhatwal
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Alvaro Pascual-Leone
- Berenson-Allen Center for Noninvasive Brain Stimulation and Cognitive Neurology Unit, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Dorene Rentz
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Reisa A Sperling
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02114, USA; Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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Hahn C, Lee CU, Won WY, Joo SH, Lim HK. Thalamic Shape and Cognitive Performance in Amnestic Mild Cognitive Impairment. Psychiatry Investig 2016; 13:504-510. [PMID: 27757128 PMCID: PMC5067344 DOI: 10.4306/pi.2016.13.5.504] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 11/20/2015] [Accepted: 12/08/2015] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE This study aimed to investigate thalamic shape alterations and their relationships with various episodic memory impairments in subjects with amnestic mild cognitive impairment (aMCI). METHODS We compared volumes and morphological alterations of the thalamus between aMCI subjects and healthy controls. In addition, we investigated the correlation between thalamic deformations and various memory impairments in aMCI subjects using a comprehensive neuropsychological battery. RESULTS The normalized left thalamic volumes of the aMCI group were significantly smaller than those of the healthy control group (p<0.0001). aMCI subjects exhibited significant thalamic deformations in the left thalamic dorso-medial and antero-medial areas compared with healthy individuals. CERAD-K Word List Memory scores were significantly correlated with the left dorso-medial areas in aMCI subjects. There were no significant correlations between verbal fluency, Boston naming test, constructional praxis, Word List Recognition, and Visuospatial Recall scores and thalamic shape in aMCI subjects. Verbal delayed recall scores were also significantly correlated with the left dorso-medial areas in the aMCI group. CONCLUSION Structural alterations in the thalamic deformations in the left dorso-medial and antero-medial areas might be core underlying neurobiological mechanisms of thalamic dysfunction related to Word List Memory and delayed verbal recall in individuals with aMCI.
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Affiliation(s)
- Changtae Hahn
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Chang-Uk Lee
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Wang Yeon Won
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Soo-Hyun Joo
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Hyun Kook Lim
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
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Prospective memory in subjective cognitive decline: a preliminary study on the role of early cognitive marker in dementia. Alzheimer Dis Assoc Disord 2016; 29:229-35. [PMID: 25187222 DOI: 10.1097/wad.0000000000000060] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Accumulating evidence shows that subjective cognitive decline (SCD) without impairment on conventional neuropsychological tests may indicate increased risk for Alzheimer disease. Previous studies of mild cognitive impairment have demonstrated the potential role of prospective memory (PM) in the early detection of cognitive decline. We thus aimed to investigate the performance of people with SCD on PM tasks relative to their healthy controls (HCs). Forty-one participants with SCD and demographically matched HCs received regular cognitive testing as well as 2 single-trial naturalistic time-based and event-based PM tasks. Statistical analyses showed that the individuals with SCD performed worse on the time-based PM task, especially on the prospective component, when compared with their HCs. Our findings suggest that PM, especially the time-based one on the prospective component, may be an early cognitive marker of dementia. This implies an underlying difficulty among subjects with SCD in self-initiation that exacerbates their memory difficulties. Further investigation on a large scale is needed.
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