Laury Tellouck1, Muriel Durieux2, Pierrick Coupé3, Audrey Cougnard-Grégoire4, Joy Tellouck5, Thomas Tourdias6, Fanny Munsch2, Arnaud Garrigues5, Catherine Helmer4, Florence Malet7, Jean-François Dartigues4, Vincent Dousset6, Cécile Delcourt4, Cédric Schweitzer1. 1. CHU de Bordeaux, Service d'Ophtalmologie, Bordeaux, France 2University of Bordeaux, Bordeaux, France 3INSERM, U1219-Bordeaux Population Health Research Center, Bordeaux, France. 2. CHU de Bordeaux, Service de Neuro-Imagerie, Bordeaux, France. 3. Université de Bordeaux, LaBRI, UMR 5800, PICTURA, Talence, France 6CNRS, LaBRI, UMR 5800, PICTURA, Talence, France. 4. University of Bordeaux, Bordeaux, France 3INSERM, U1219-Bordeaux Population Health Research Center, Bordeaux, France. 5. CHU de Bordeaux, Service d'Ophtalmologie, Bordeaux, France. 6. University of Bordeaux, Bordeaux, France 4CHU de Bordeaux, Service de Neuro-Imagerie, Bordeaux, France 7INSERM, U1215, Neurocentre Magendie, Bordeaux, France. 7. Centre d'Ophtalmologie Point Vision, Bordeaux, France.
Abstract
Purpose: To compare microstructural changes along the optical radiations and brain structure volumes between glaucoma and control subjects using in vivo magnetic resonance imaging and to analyze their association with severity of the disease. Methods: A total of 50 open-angle glaucoma subjects and 50 healthy age- and sex-matched controls underwent detailed ophthalmologic examinations (including visual field testing [VF], funduscopy, and spectral-domain optical coherence tomography) as well as diffusion tensor imaging (DTI) using 3.0-Tesla magnetic resonance imaging. Fractional anisotropy (FA), mean diffusivity, radial diffusivity (RD), and axial diffusivity (AD) were quantified semiautomatically along the optical radiations. DTI parameters and volumes of specific brain structures were compared between cases and controls using conditional logistic regression. Association between DTI metrics and the severity of the disease was studied using linear mixed regression analyses. Results: In glaucoma subjects, optic radiations FA was significantly lower (0.57 vs. 0.59; P = 0.02) and RD was significantly higher (52.78 10-5 mm2/s vs. 49.74 10-5 mm2/s; P = 0.03) than in controls. Optic radiations FA was significantly correlated with homolateral functional and structural damage of glaucoma (mean deviation of VF [P = 0.03], retinal nerve fiber layer thickness [P = 0.03], vertical cup to disc ratio [P = 0.0007]). Volume and DTI parameters of other brain structures (including hippocampus) were not significantly different between glaucoma patients and controls. Conclusions: We evidenced microstructural modifications along visual pathways of glaucoma patients and these alterations were correlated with disease severity. The association of glaucoma with other neurodegenerative alterations would need further exploration and a prospective follow-up of our cohort of subjects. (ClinicalTrials.gov number, NCT01621841).
Purpose: To compare microstructural changes along the optical radiations and brain structure volumes between glaucoma and control subjects using in vivo magnetic resonance imaging and to analyze their association with severity of the disease. Methods: A total of 50 open-angle glaucoma subjects and 50 healthy age- and sex-matched controls underwent detailed ophthalmologic examinations (including visual field testing [VF], funduscopy, and spectral-domain optical coherence tomography) as well as diffusion tensor imaging (DTI) using 3.0-Tesla magnetic resonance imaging. Fractional anisotropy (FA), mean diffusivity, radial diffusivity (RD), and axial diffusivity (AD) were quantified semiautomatically along the optical radiations. DTI parameters and volumes of specific brain structures were compared between cases and controls using conditional logistic regression. Association between DTI metrics and the severity of the disease was studied using linear mixed regression analyses. Results: In glaucoma subjects, optic radiations FA was significantly lower (0.57 vs. 0.59; P = 0.02) and RD was significantly higher (52.78 10-5 mm2/s vs. 49.74 10-5 mm2/s; P = 0.03) than in controls. Optic radiations FA was significantly correlated with homolateral functional and structural damage of glaucoma (mean deviation of VF [P = 0.03], retinal nerve fiber layer thickness [P = 0.03], vertical cup to disc ratio [P = 0.0007]). Volume and DTI parameters of other brain structures (including hippocampus) were not significantly different between glaucomapatients and controls. Conclusions: We evidenced microstructural modifications along visual pathways of glaucomapatients and these alterations were correlated with disease severity. The association of glaucoma with other neurodegenerative alterations would need further exploration and a prospective follow-up of our cohort of subjects. (ClinicalTrials.gov number, NCT01621841).
Authors: Kevin C Chan; Yu Yu; Shuk Han Ng; Heather K Mak; Yolanda W Y Yip; Yolandi van der Merwe; Tianmin Ren; Jasmine S Y Yung; Sayantan Biswas; Xu Cao; Ying Chau; Christopher K S Leung Journal: Acta Biomater Date: 2019-06-06 Impact factor: 8.947