Previsões anatômicas e funcionais das habilidades de visão cega em pacientes com hemianopsia lateral homônima (PRE-SIGHT)
Homonymous lateral hemianopia (HLH) is characterized by loss of vision in half the visual field, and is the most common neurovisual disorder following stroke.
Numerous behavioral and neuroanatomical studies have focused on the phenomenon of blindsight, corresponding to patients' unconscious residual visual capacities in the blind hemifield. Cohort studies of patients have highlighted different types of blindsight, and a low occurrence of the phenomenon initially described: (1) type 1 blindsight (≈12%), unconscious visual abilities; (2) type 2 blindsight, visual abilities associated with sensations in the blind field (≈18%); (3) blindsense, sensations in the blind field without visual abilities (≈30%); and (4) no blindsight (≈40%). The heterogeneity of these blindsight abilities in the HLH population is closely related to patients' neuroanatomical and functional profiles.
In particular, resting-state functional imaging (r-fMRI) and default mode network analysis have highlighted a significant correlation between the degree of inter-hemispheric connection (between the healthy and injured hemispheres) and the rate of spontaneous visual field recovery. To our knowledge, this degree of functional connectivity has not yet been studied in relation to blindsight abilities. However, this functional MRI measurement tool represents a potential predictive factor for patients' residual performance in their blindsight field, in order to assess the level of visuo-cognitive impairment and, ultimately, to adapt care.
Visão geral do estudo
Status
Tipo de estudo
Inscrição (Estimado)
Contactos e Locais
Contato de estudo
- Nome: Amelie Yavchitz, Dr
- Número de telefone: 0148036454
- E-mail: ayavchitz@for.paris
Estude backup de contato
- Nome: Sadia MEDAOURI
- Número de telefone: 0148036277
- E-mail: smedaouri@for.paris
Locais de estudo
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Paris, França, 75019
- Hopital Fondation Adolphe de Rothschild
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Contato:
- clementine GARRIC
- E-mail: clgarric@for.paris
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Critérios de participação
Critérios de elegibilidade
Idades elegíveis para estudo
Aceita Voluntários Saudáveis
Gêneros Elegíveis para o Estudo
Método de amostragem
População do estudo
Patients over 18 years of age with homonymous lateral hemianopia undergoing cerebral MRI for follow-up and rehabilitation following stroke
Descrição
Inclusion Criteria:
- Subjects aged 18 and over
- with homonymous visual field amputation sequelae of a retrochiasmatic lesion of vascular origin (stroke), including the occipital region (primary visual cortex, optic radiations, associated occipital areas)
- Requires follow-up brain MRI as part of treatment
- Able to perform experimental tasks on computer
- Express consent to participate in the study
- Member or beneficiary of a social security scheme
Exclusion Criteria:
- Severe neuropsychological disorders (language, memory, attention, vigilance, reasoning)
- Severe ophthalmological disorders or visual acuity below 3/10 prior to stroke
- Progressive ophthalmological disorders (cataract or glaucoma) likely to bias measurements
- Major psychiatric or behavioral disorders making care impossible
- Patient benefiting from a legal protection measure
- Pregnant or breast-feeding women (declarative information)
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Modelos de observação: CASE_ONLY
- Perspectivas de Tempo: CROSS_SECTIONAL
O que o estudo está medindo?
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
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Description of resting-state functional MRI measurement of the degree of Resting State Functional Connectivity (RSFC) between left and right hemisphere regions.
Prazo: DAY 0
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Comparison of the degree of inter-hemispheric Resting State Functional Connectivity between the four patient groups: absence of blindsight, type I blindsight, type II blindsight and blindsense. |
DAY 0
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Medidas de resultados secundários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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Correlation between inter-hemispheric functional connectivity and blindsight performance
Prazo: DAY 0
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Resting-state functional MRI measurement of the degree of RSFC between left and right hemisphere regions of interest. Blindsight performance assessed by measuring the sensitivity of discrimination of spatial orientation (horizontal/vertical) of lines presented in the patient's blind field (blindsight). |
DAY 0
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Density and intensity of visual and attentional default networks in each type of blindsight
Prazo: DAY 0
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Calculation (Graph Theory) of neural network matrices, weighted and created on the basis of correlations of activations in different brain regions during resting-state functional MRI measurement . |
DAY 0
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Blindsight performance according to the laterality of the lesion (left or right hemisphere)
Prazo: DAY 0
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Blindsight performance assessed by measuring the sensitivity of discrimination of spatial orientation (horizontal/vertical) of lines presented in the patient's blind field (blindsight) |
DAY 0
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Correlation between the level of inter-hemispheric functional connectivity and blindsight performance
Prazo: DAY 0
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Resting-state functional MRI measurement of the degree of Resting State Functional Connectivity (RSFC) between left and right hemisphere regions of interest, blindsight performance assessed by measuring the sensitivity of spatial orientation discrimination (horizontal/vertical) of lines presented in the blindsight field. |
DAY 0
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Correlation between visual default network density and intensity and blindsight performance
Prazo: DAY 0
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Computation (Graph Theory) of neural network matrices, weighted and created on the basis of correlations of activations of different brain regions during Resting-state functional MRI measurement. Blindsight performance assessed by measuring the sensitivity of discrimination of spatial orientation (horizontal/vertical) of lines presented in the patient's blind field (blindsight). |
DAY 0
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Correlation between lesion volume and blindsight performance
Prazo: DAY 0
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Blindsight performance assessed by measuring the sensitivity of spatial orientation discrimination (horizontal/vertical) of lines presented in the patient's blind field (blindsight). |
DAY 0
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Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Clémentine GARRIC, Integrative Neuroscience and Cognition Center
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo (Estimado)
Conclusão Primária (Estimado)
Conclusão do estudo (Estimado)
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Real)
Atualizações de registro de estudo
Última Atualização Postada (Real)
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Mais Informações
Termos relacionados a este estudo
Termos MeSH relevantes adicionais
- Manifestações Neurológicas
- Distúrbios Cerebrovasculares
- Doenças Cerebrais
- Doenças do Sistema Nervoso Central
- Doenças do Sistema Nervoso
- Doenças Vasculares
- Doenças cardiovasculares
- Doenças oculares
- Distúrbios da Visão
- Distúrbios da Sensação
- Cegueira
- Condições Patológicas, Sinais e Sintomas
- Sinais e sintomas
- Derrame
- Hemianopsia
- Cegueira Cortical
Outros números de identificação do estudo
- CGC_2024_3
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