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Guillon J, Attal Y, Colliot O, La Corte V, Dubois B, Schwartz D, Chavez M, De Vico Fallani F. Loss of brain inter-frequency hubs in Alzheimer's disease. Sci Rep 2017; 7:10879. [PMID: 28883408 PMCID: PMC5589939 DOI: 10.1038/s41598-017-07846-w] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 06/29/2017] [Indexed: 01/05/2023] Open
Abstract
Alzheimer's disease (AD) causes alterations of brain network structure and function. The latter consists of connectivity changes between oscillatory processes at different frequency channels. We proposed a multi-layer network approach to analyze multiple-frequency brain networks inferred from magnetoencephalographic recordings during resting-states in AD subjects and age-matched controls. Main results showed that brain networks tend to facilitate information propagation across different frequencies, as measured by the multi-participation coefficient (MPC). However, regional connectivity in AD subjects was abnormally distributed across frequency bands as compared to controls, causing significant decreases of MPC. This effect was mainly localized in association areas and in the cingulate cortex, which acted, in the healthy group, as a true inter-frequency hub. MPC values significantly correlated with memory impairment of AD subjects, as measured by the total recall score. Most predictive regions belonged to components of the default-mode network that are typically affected by atrophy, metabolism disruption and amyloid-β deposition. We evaluated the diagnostic power of the MPC and we showed that it led to increased classification accuracy (78.39%) and sensitivity (91.11%). These findings shed new light on the brain functional alterations underlying AD and provide analytical tools for identifying multi-frequency neural mechanisms of brain diseases.
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Affiliation(s)
- J Guillon
- Inria Paris, Aramis project-team, 75013, Paris, France
- CNRS UMR-7225, Sorbonne Universites, UPMC Univ Paris 06, Inserm U-1127, Institut du cerveau et la moelle (ICM), Hopital Pitie-Salpetriere, 75013, Paris, France
| | - Y Attal
- MyBrain Technologies, Paris, France
| | - O Colliot
- Inria Paris, Aramis project-team, 75013, Paris, France
- CNRS UMR-7225, Sorbonne Universites, UPMC Univ Paris 06, Inserm U-1127, Institut du cerveau et la moelle (ICM), Hopital Pitie-Salpetriere, 75013, Paris, France
| | - V La Corte
- Institute of Psychology, University Paris Descartes, Sorbonne Paris Cite, France
- INSERM UMR 894, Center of Psychiatry and Neurosciences, Memory and Cognition Laboratory, Paris, France
| | - B Dubois
- Department of Neurology, Institut de la Memoire et de la Maladie dAlzheimer - IM2A, Paris, France
| | - D Schwartz
- CNRS UMR-7225, Sorbonne Universites, UPMC Univ Paris 06, Inserm U-1127, Institut du cerveau et la moelle (ICM), Hopital Pitie-Salpetriere, 75013, Paris, France
| | - M Chavez
- CNRS UMR-7225, Sorbonne Universites, UPMC Univ Paris 06, Inserm U-1127, Institut du cerveau et la moelle (ICM), Hopital Pitie-Salpetriere, 75013, Paris, France
| | - F De Vico Fallani
- Inria Paris, Aramis project-team, 75013, Paris, France.
- CNRS UMR-7225, Sorbonne Universites, UPMC Univ Paris 06, Inserm U-1127, Institut du cerveau et la moelle (ICM), Hopital Pitie-Salpetriere, 75013, Paris, France.
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Rosso C, Attal Y, Deltour S, Hevia-Montiel N, Lehéricy S, Crozier S, Dormont D, Baillet S, Samson Y. Hyperglycemia and the fate of apparent diffusion coefficient-defined ischemic penumbra. AJNR Am J Neuroradiol 2011; 32:852-6. [PMID: 21454405 DOI: 10.3174/ajnr.a2407] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND AND PURPOSE Previous data have shown the feasibility of identifying ischemic penumbra in patients with acute stroke by using a semiautomated analysis of ADC maps. Here, we investigated whether the fate of ADC-defined penumbra was altered by HG. We also examined the interaction between HG and arterial recanalization on infarct growth. MATERIALS AND METHODS We examined 94 patients by using MR imaging within 6 hours of stroke onset and a follow-up MR imaging within 7 days. The ADC-defined tissue-at-risk was calculated from the early MR imaging. Patients were classified according to high (>7 mmol/L; n = 34/94, HG) or normal (n = 60/94) baseline SGL. The impact of HG status on infarct growth was assessed by using multiple regression models and analysis of the slopes of regression lines for each group. Interaction between HG status and arterial recanalization on infarct growth was investigated by using multiple regression analysis. RESULTS The slope of the predicted versus observed infarct growth regression line was steeper in HG than non-HG patients (P = .0008), suggesting that infarct growth within ADC-defined tissue-at-risk was increased in HG patients. The effect was 2.8 times more severe in nonrecanalized patients (P = .01) than in patients with recanalization (P = .001). CONCLUSIONS ADC-defined tissue-at-risk may represent ischemic penumbra because part of this area may be salvaged in normal SGL patients. The toxicity in HG patients seems to be more related to penumbra-infarction transition than reperfusion injury in humans because the effect was larger in nonrecanalized than in recanalized patients.
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Affiliation(s)
- C Rosso
- AP-HP, Urgences Cérébro-Vasculaires, Pitié-Salpêtrière Hospital, Paris, France.
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Dumas T, Attal Y, Dubal S, Jouvent R, George N. Detection of activity from the amygdala with magnetoencephalography. Ing Rech Biomed 2011. [DOI: 10.1016/j.irbm.2010.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Fischbach M, Attal Y, Geisert J. Hemodiafiltration versus hemodialysis in children. Int J Pediatr Nephrol 1984; 5:151-4. [PMID: 6500809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A total of 6 anuric children have been suitable treated with HD for 12 months and subsequently with HDF for 12 other months. Session time, tolerance and quality of epuration are compared in HD and HDF. Hemodiafiltration combining hemodialysis and hemofiltration in the same treatment time realizes in a short time (about 50% of hemodialysis session time) an optimal epuration with a good tolerance in children.
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Fischbach M, Sommermater JI, Obry F, Manière MC, Frank RM, Attal Y, Geisert J. [Dental anomalies in children with chronic renal insufficiency (II)]. Med Hyg (Geneve) 1984; 42:1346, 1349-50. [PMID: 6589461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Fischbach M, Sommermater JI, Obray F, Manière MC, Frank RM, Attal Y, Geisert J. [Dental anomalies in children with chronic renal insufficiency (I)]. Med Hyg (Geneve) 1984; 42:1259, 1261. [PMID: 6589460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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