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Donica VC, Alexa AI, Pavel IA, Danielescu C, Ciapă MA, Donica AL, Bogdănici CM. The Evolvement of OCT and OCT-A in Identifying Multiple Sclerosis Biomarkers. Biomedicines 2023; 11:3031. [PMID: 38002031 PMCID: PMC10669604 DOI: 10.3390/biomedicines11113031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/09/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
The prevalence of multiple sclerosis (MS) has been increasing among young people in developing countries over the last years. With the continuous development of new technology, the diagnosis and follow-up of these patients has received new parameters that physicians may use in their practice. This paper reviews the main biomarkers identified through Optical Coherence Tomography Angiography (OCT-A) involved in the development and progression of MS and investigates the role it may have in detecting changes to the central nervous system (CNS).
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Affiliation(s)
- Vlad Constantin Donica
- Department of Ophthalmology, Faculty of Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, University Street, No. 16, 700115 Iasi, Romania; (V.C.D.); (C.D.); (C.M.B.)
| | - Anisia Iuliana Alexa
- Department of Ophthalmology, Faculty of Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, University Street, No. 16, 700115 Iasi, Romania; (V.C.D.); (C.D.); (C.M.B.)
| | - Irina Andreea Pavel
- Department of Ophthalmology, Faculty of Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, University Street, No. 16, 700115 Iasi, Romania; (V.C.D.); (C.D.); (C.M.B.)
| | - Ciprian Danielescu
- Department of Ophthalmology, Faculty of Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, University Street, No. 16, 700115 Iasi, Romania; (V.C.D.); (C.D.); (C.M.B.)
| | | | | | - Camelia Margareta Bogdănici
- Department of Ophthalmology, Faculty of Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, University Street, No. 16, 700115 Iasi, Romania; (V.C.D.); (C.D.); (C.M.B.)
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Sharma SN, Marsh JW, Tsipursky MS, Boppart SA. Ratiometric Analysis of In Vivo Optical Coherence Tomography Retinal Layer Thicknesses for Detection of Changes in Alzheimer's Disease. TRANSLATIONAL BIOPHOTONICS 2023; 5:e202300003. [PMID: 38617043 PMCID: PMC11013958 DOI: 10.1002/tbio.202300003] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/22/2023] [Indexed: 04/16/2024] Open
Abstract
We analyzed ophthalmic retinal optical coherence tomography (OCT) images from patients with Alzheimer's disease (AD) to identify retinal layer thickness and ratio changes that may serve as image-based biomarkers for the disease. One three-dimensional volume before and one after diagnosis for each of 48 patients were segmented to identify retinal layer and total retinal thicknesses. Between before- and after-diagnosis retinal OCT images, there were significant thickness changes in six of ten (60%) retinal layers across all 48 patients. Through a comparison with age-matched healthy subjects, the significant changes were attributed to AD only (NFL and PR2 layers), age only (GCL, IPL, and RPE layers), or both AD and age (OPL layer). Analyzing ratios of retinal layer thicknesses, 53 of 90 (58.89%) ratios had significant changes. The four independently non-significant layers were assessed to be affected by neither AD nor age (INL layer) or both AD and age (ELM, PR1, and BM layers). The demonstrated image segmentation, measurement, and ratiometric analysis of retinal layers in AD patients may yield a noninvasive OCT image-based retinal biomarker that can be used to detect retinal changes associated with this disease.
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Affiliation(s)
- Shonit N Sharma
- Carle Illinois College of Medicine, University of Illinois Urbana-Champaign, Urbana, IL, USA
| | - Jordan W Marsh
- Carle Illinois College of Medicine, University of Illinois Urbana-Champaign, Urbana, IL, USA
| | - Michael S Tsipursky
- Carle Illinois College of Medicine, University of Illinois Urbana-Champaign, Urbana, IL, USA
| | - Stephen A Boppart
- Carle Illinois College of Medicine, University of Illinois Urbana-Champaign, Urbana, IL, USA
- Department of Electrical and Computer Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA
- Department of Bioengineering, University of Illinois Urbana-Champaign, Urbana, IL, USA
- Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL, USA
- NIH Center for Label-free Imaging and Multiscale Biophotonics (CLIMB), University of Illinois Urbana-Champaign, Urbana, IL, USA
- Interdisciplinary Health Sciences Institute, University of Illinois Urbana-Champaign, Urbana, IL, USA
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Yang C, Yao L, Zhou L, Qian S, Meng J, Yang L, Chen L, Tan Y, Qiu H, Gu Y, Ding Z, Li P, Liu Z. Mapping port wine stain in vivo by optical coherence tomography angiography and multi-metric characterization. OPTICS EXPRESS 2023; 31:13613-13626. [PMID: 37157245 DOI: 10.1364/oe.485619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Port wine stain (PWS) is a congenital cutaneous capillary malformation composed of ecstatic vessels, while the microstructure of these vessels remains largely unknown. Optical coherence tomography angiography (OCTA) serves as a non-invasive, label-free and high-resolution tool to visualize the 3D tissue microvasculature. However, even as the 3D vessel images of PWS become readily accessible, quantitative analysis algorithms for their organization have mainly remained limited to analysis of 2D images. Especially, 3D orientations of vasculature in PWS have not yet been resolved at a voxel-wise basis. In this study, we employed the inverse signal-to-noise ratio (iSNR)-decorrelation (D) OCTA (ID-OCTA) to acquire 3D blood vessel images in vivo from PWS patients, and used the mean-subtraction method for de-shadowing to correct the tail artifacts. We developed algorithms which mapped blood vessels in spatial-angular hyperspace in a 3D context, and obtained orientation-derived metrics including directional variance and waviness for the characterization of vessel alignment and crimping level, respectively. Combining with thickness and local density measures, our method served as a multi-parametric analysis platform which covered a variety of morphological and organizational characteristics at a voxel-wise basis. We found that blood vessels were thicker, denser and less aligned in lesion skin in contrast to normal skin (symmetrical parts of skin lesions on the cheek), and complementary insights from these metrics led to a classification accuracy of ∼90% in identifying PWS. An improvement in sensitivity of 3D analysis was validated over 2D analysis. Our imaging and analysis system provides a clear picture of the microstructure of blood vessels within PWS tissues, which leads to a better understanding of this capillary malformation disease and facilitates improvements in diagnosis and treatment of PWS.
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Young N, Zivadinov R, Dwyer MG, Bergsland N, Weinstock-Guttman B, Jakimovski D. Retinal Blood Vessel Analysis Using Optical Coherence Tomography (OCT) in Multiple Sclerosis. Diagnostics (Basel) 2023; 13:diagnostics13040596. [PMID: 36832084 PMCID: PMC9955793 DOI: 10.3390/diagnostics13040596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 01/20/2023] [Accepted: 02/04/2023] [Indexed: 02/08/2023] Open
Abstract
Background: Both greater retinal neurodegenerative pathology and greater cardiovascular burden are seen in people with multiple sclerosis (pwMS). Studies also describe multiple extracranial and intracranial vascular changes in pwMS. However, there have been few studies examining the neuroretinal vasculature in MS. Our aim is to determine differences in retinal vasculature between pwMS and healthy controls (HCs) and to determine the relationship between retinal nerve fiber layer (RNFL) thickness and retinal vasculature characteristics. Methods: A total of 167 pwMS and 48 HCs were scanned using optical coherence tomography (OCT). Earlier OCT scans were available for 101 pwMS and 35 HCs for an additional longitudinal analysis. Segmentation of retinal vasculature was performed in a blinded manner in MATLAB's optical coherence tomography segmentation and evaluation GUI (OCTSEG) software. Results: PwMS has fewer retinal blood vessels when compared to HCs (35.1 vs. 36.8, p = 0.017). Over the 5.4 year follow up, and when compared to HCs, pwMS has a significant decrease in number of retinal vessels (average loss of -3.7 p = 0.007). Moreover, the total vessel diameter in pwMS does not change when compared to the increase in vessel diameter in the HCs (0.06 vs. 0.3, p = 0.017). Only in pwMS is there an association between lower RNFL thickness and fewer retinal vessel number and smaller diameter (r = 0.191, p = 0.018 and r = 0.216, p = 0.007). Conclusions: Over 5 years, pwMS exhibit significant retinal vascular changes that are related to greater atrophy of the retinal layers.
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Affiliation(s)
- Nicholas Young
- Buffalo Neuroimaging Analysis Center (BNAC), Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Robert Zivadinov
- Buffalo Neuroimaging Analysis Center (BNAC), Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
- Center for Biomedical Imaging and Clinical Translational Science Institute, University at Buffalo, State University of New York, Buffalo, NY 14203, USA
| | - Michael G. Dwyer
- Buffalo Neuroimaging Analysis Center (BNAC), Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Niels Bergsland
- Buffalo Neuroimaging Analysis Center (BNAC), Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
- RCCS, Fondazione Don Carlo Gnocchi ONLUS, 20121 Milan, Italy
| | - Bianca Weinstock-Guttman
- Jacobs Comprehensive MS Treatment and Research Center, Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY 14202, USA
| | - Dejan Jakimovski
- Buffalo Neuroimaging Analysis Center (BNAC), Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
- Correspondence: ; Tel.: +1-716-859-7040
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Multi-modal retinal scanning to measure retinal thickness and peripheral blood vessels in multiple sclerosis. Sci Rep 2022; 12:20472. [PMID: 36443364 PMCID: PMC9705292 DOI: 10.1038/s41598-022-24312-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 11/14/2022] [Indexed: 11/29/2022] Open
Abstract
Our purpose was to investigate changes to the retina in multiple sclerosis (MS) using established and novel modes of retinal image acquisition and analysis. 72 participants with MS and 80 healthy volunteers underwent retinal scanning with optical coherence tomography (OCT) and ultra-widefield (UWF) scanning laser ophthalmoscopy (SLO), over a two-year period. Changes in retinal nerve fibre layer (RNFL) thickness, macular volume and retinal blood vessel diameter were measured and parameters were then tested for associations with MS. Measurements from OCT showed that individuals with MS had a thinner RNFL and reduced macular volume when compared to healthy volunteers. On UWF images, participants with MS had reduced arterial widths in the inferior nasal quadrant of both eyes and reduced venous widths in the inferior nasal quadrant of right eyes. Longitudinal analysis showed that participants with MS had an accelerated annual rate of RNFL thinning in several regions of the retina. In conclusion, the assessment of OCT showed thinning of the RNFL and macula in concordance with previous reports on MS, while analysis of blood vessels in the retinal periphery from UWF-SLO images revealed novel changes.
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García-Sierra R, López-Lifante VM, Isusquiza Garcia E, Heras A, Besada I, Verde Lopez D, Alzamora MT, Forés R, Montero-Alia P, Ugarte Anduaga J, Torán-Monserrat P. Automated Systems for Calculating Arteriovenous Ratio in Retinographies: A Scoping Review. Diagnostics (Basel) 2022; 12:diagnostics12112865. [PMID: 36428925 PMCID: PMC9689345 DOI: 10.3390/diagnostics12112865] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 10/29/2022] [Accepted: 11/14/2022] [Indexed: 11/22/2022] Open
Abstract
There is evidence of an association between hypertension and retinal arteriolar narrowing. Manual measurement of retinal vessels comes with additional variability, which can be eliminated using automated software. This scoping review aims to summarize research on automated retinal vessel analysis systems. Searches were performed on Medline, Scopus, and Cochrane to find studies examining automated systems for the diagnosis of retinal vascular alterations caused by hypertension using the following keywords: diagnosis; diagnostic screening programs; image processing, computer-assisted; artificial intelligence; electronic data processing; hypertensive retinopathy; hypertension; retinal vessels; arteriovenous ratio and retinal image analysis. The searches generated 433 articles. Of these, 25 articles published from 2010 to 2022 were included in the review. The retinographies analyzed were extracted from international databases and real scenarios. Automated systems to detect alterations in the retinal vasculature are being introduced into clinical practice for diagnosis in ophthalmology and other medical specialties due to the association of such changes with various diseases. These systems make the classification of hypertensive retinopathy and cardiovascular risk more reliable. They also make it possible for diagnosis to be performed in primary care, thus optimizing ophthalmological visits.
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Affiliation(s)
- Rosa García-Sierra
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
- Multidisciplinary Research Group in Health and Society GREMSAS (2017 SGR 917), 08007 Barcelona, Spain
- Nursing Department, Faculty of Medicine, Universitat Autònoma de Barcelona, Campus Bellaterra, 08193 Barcelona, Spain
- Primary Care Group, Germans Trias i Pujol Research Institute (IGTP), 08916 Badalona, Spain
| | - Victor M. López-Lifante
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
- Palau-solità i Plegamans Primary Healthcare Centre, Palau-solità i Plegamans, Gerència d’Àmbit d’Atenció Primària Metropolitana Nord, Institut Català de la Salut, 08184 Barcelona, Spain
- Correspondence:
| | | | - Antonio Heras
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
- Primary Healthcare Centre Riu Nord-Riu Sud, Gerència d’Àmbit d’Atenció Primària Metropolitana Nord, Institut Català de la Salut, Santa Coloma de Gramenet, 08921 Barcelona, Spain
| | - Idoia Besada
- ULMA Medical Technologies, S. Coop, 20560 Onati, Spain
| | - David Verde Lopez
- Institut Universitari d’Investigació en Atenció Primària Jordi Gol (IDIAP Jordi Gol), 08007 Barcelona, Spain
| | - Maria Teresa Alzamora
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
- Primary Healthcare Centre Riu Nord-Riu Sud, Gerència d’Àmbit d’Atenció Primària Metropolitana Nord, Institut Català de la Salut, Santa Coloma de Gramenet, 08921 Barcelona, Spain
| | - Rosa Forés
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
| | - Pilar Montero-Alia
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
| | | | - Pere Torán-Monserrat
- Research Support Unit Metropolitana Nord, Primary Care Research Institut Jordi Gol (IDIAPJGol), 08303 Mataró, Spain
- Multidisciplinary Research Group in Health and Society GREMSAS (2017 SGR 917), 08007 Barcelona, Spain
- Primary Care Group, Germans Trias i Pujol Research Institute (IGTP), 08916 Badalona, Spain
- Department of Medicine, Faculty of Medicine, Universitat de Girona, 17004 Girona, Spain
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Drobnjak Nes D, Berg-Hansen P, de Rodez Benavent SA, Høgestøl EA, Beyer MK, Rinker DA, Veiby N, Karabeg M, Petrovski BÉ, Celius EG, Harbo HF, Petrovski G. Exploring Retinal Blood Vessel Diameters as Biomarkers in Multiple Sclerosis. J Clin Med 2022; 11:jcm11113109. [PMID: 35683496 PMCID: PMC9181486 DOI: 10.3390/jcm11113109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 04/26/2022] [Accepted: 04/26/2022] [Indexed: 12/12/2022] Open
Abstract
We aimed to determine whether retinal vessel diameters and retinal oxygen saturation in newly diagnosed patients with multiple sclerosis (pwMS) are different from those of a healthy population. Retinal blood vessel diameters were measured using imaging with a spectrophotometric non-invasive retinal oximeter. Twenty-three newly diagnosed untreated relapsing-remitting MS (RRMS) patients (mean age: 32.2 ± 7.5 years, age range = 18-50 years, 56.5% female) were measured and compared to 23 age- and sex-matched healthy controls (HCs) (mean age: 34.8 ± 8.1 years). Patients with Optic Neuritis were excluded. Retinal venular diameter (143.8 µm versus 157.8 µm: mean; p = 0.0013) and retinal arteriolar diameter (112.6 µm versus 120.6 µm: mean; p = 0.0089) were smaller in pwMS when compared with HCs, respectively. There was no significant difference in the oxygen saturation in retinal venules and arterioles in pwMS (mean: 60.0% and 93.7%; p = 0.5980) compared to HCs (mean: 59.3% and 91.5%; p = 0.8934), respectively. There was a significant difference in the median low contrast visual acuity (2.5% contrast) between the pwMS and the HC groups (p = 0.0143) Retinal arteriolar and venular diameter may have potential as objective biomarkers for MS.
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Affiliation(s)
- Dragana Drobnjak Nes
- Center of Eye Research, Department of Ophthalmology, Oslo University Hospital, 0450 Oslo, Norway; (D.D.N.); (S.A.d.R.B.); (N.V.); (M.K.)
| | - Pål Berg-Hansen
- Department of Neurology, Oslo University Hospital, 0372 Oslo, Norway; (P.B.-H.); (E.A.H.); (D.A.R.); (E.G.C.); (H.F.H.)
| | - Sigrid A. de Rodez Benavent
- Center of Eye Research, Department of Ophthalmology, Oslo University Hospital, 0450 Oslo, Norway; (D.D.N.); (S.A.d.R.B.); (N.V.); (M.K.)
| | - Einar A. Høgestøl
- Department of Neurology, Oslo University Hospital, 0372 Oslo, Norway; (P.B.-H.); (E.A.H.); (D.A.R.); (E.G.C.); (H.F.H.)
- Department of Psychology, University of Oslo, 0373 Oslo, Norway
| | - Mona K. Beyer
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
- Department of Radiology and Nuclear Medicine, Oslo University Hospital, 0379 Oslo, Norway
| | - Daniel A. Rinker
- Department of Neurology, Oslo University Hospital, 0372 Oslo, Norway; (P.B.-H.); (E.A.H.); (D.A.R.); (E.G.C.); (H.F.H.)
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
| | - Nina Veiby
- Center of Eye Research, Department of Ophthalmology, Oslo University Hospital, 0450 Oslo, Norway; (D.D.N.); (S.A.d.R.B.); (N.V.); (M.K.)
| | - Mia Karabeg
- Center of Eye Research, Department of Ophthalmology, Oslo University Hospital, 0450 Oslo, Norway; (D.D.N.); (S.A.d.R.B.); (N.V.); (M.K.)
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
| | - Beáta Éva Petrovski
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
| | - Elisabeth G. Celius
- Department of Neurology, Oslo University Hospital, 0372 Oslo, Norway; (P.B.-H.); (E.A.H.); (D.A.R.); (E.G.C.); (H.F.H.)
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
| | - Hanne F. Harbo
- Department of Neurology, Oslo University Hospital, 0372 Oslo, Norway; (P.B.-H.); (E.A.H.); (D.A.R.); (E.G.C.); (H.F.H.)
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
| | - Goran Petrovski
- Center of Eye Research, Department of Ophthalmology, Oslo University Hospital, 0450 Oslo, Norway; (D.D.N.); (S.A.d.R.B.); (N.V.); (M.K.)
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0372 Oslo, Norway; (M.K.B.); (B.É.P.)
- Correspondence:
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Ava S, Tamam Y, Hazar L, Karahan M, Erdem S, Dursun ME, Keklikçi U. Relationship between optical coherence tomography angiography and visual evoked potential in patients with multiple sclerosis. Indian J Ophthalmol 2022; 70:873-878. [PMID: 35225535 PMCID: PMC9114564 DOI: 10.4103/ijo.ijo_431_21] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Purpose: This study aimed to identify an easy-to-apply biomarker by correlating visual evoked potential (VEP) with optical coherence tomography angiography (OCTA) results in multiple sclerosis (MS). Methods: Our study was planned prospectively. Patients with MS were divided into two groups, VEP prolonged group 1 and VEP normal group 2. Age-matched and gender-matched healthy individuals (group 3) were included as the control group. Vascular density (VD) of the optic nerve head (ONH) and radial peripapillary capillaries (RPCs) were measured and recorded by OCTA. The optic nerve damage of patients was measured and recorded with a VEP device. Results: Thirty-two eyes were included in group 1, 50 eyes were included in group 2, and 51 healthy eyes were included in group 3. In terms of visual acuity, group 1 was significantly lower than the other groups (P < 0.001). Regardless of the prolongation of p100 latency in patients with MS, whole image, inside disc ONH VD and in the same sectors in RPC VD were found to be significantly lower than the control group (P < 0.05). Retinal nerve fiber layer thickness was found to be significantly lower in group 1 than in group 2 and group 3 (P < 0.05). There was a significant correlation between low ONH VD and RPC VD and prolonged VEP P100 (P < 0.05). Conclusion: VEP measurements can be correlated with OCTA measurements in patients with MS and can be used as a biomarker to determine the degree of optic nerve damage.
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Affiliation(s)
- Sedat Ava
- Dicle University School of Medicine, Department of Ophthalmology, Diyarbakır, Turkey
| | - Yusuf Tamam
- Dicle University School of Medicine, Department of Neurology, Diyarbakır, Turkey
| | - Leyla Hazar
- Dicle University School of Medicine, Department of Ophthalmology, Diyarbakır, Turkey
| | - Mine Karahan
- Dicle University School of Medicine, Department of Ophthalmology, Diyarbakır, Turkey
| | - Seyfettin Erdem
- Dicle University School of Medicine, Department of Ophthalmology, Diyarbakır, Turkey
| | - Mehmet Emin Dursun
- Dicle University School of Medicine, Department of Ophthalmology, Diyarbakır, Turkey
| | - Ugur Keklikçi
- Dicle University School of Medicine, Department of Ophthalmology, Diyarbakır, Turkey
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Analysis of choroidal vessel density in patients with multiple sclerosis. Biomark Neuropsychiatry 2021. [DOI: 10.1016/j.bionps.2021.100040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Differential patterns of parafoveal and peripapillary vessel density in multiple sclerosis and neuromyelitis optica spectrum disorder. Mult Scler Relat Disord 2021; 49:102780. [PMID: 33508571 DOI: 10.1016/j.msard.2021.102780] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 01/14/2021] [Accepted: 01/16/2021] [Indexed: 12/23/2022]
Abstract
BACKGROUND To compare intraocular microvascular alterations between patients with multiple sclerosis (MS) and neuromyelitis optica spectrum disorder (NMOSD) using optical coherence tomography angiography (OCT-A). METHODS Sixty patients were included in the study, 23 MS patients (36 eyes) and 37 NMOSD patients (47 eyes), all with a history of optic neuritis (ON). All subjects underwent comprehensive ophthalmic examinations, OCT-A, and high-definition-OCT imaging. OCT-A was used to measure the vessel density of the superficial and deep retinal capillary plexus (SRCP and DRCP) in the macular area and the radial peripapillary capillary (RPC) segment. Age, spherical equivalent, and gender were adjusted for in the analyses. RESULTS Patients with NMOSD showed significantly decreased vessel density of the SRCP (average, p = 0.0007; superior, p = 0.0009; inferior, p = 0.0002) and RPC segment (average, p < 0.0001; superior, p = 0.0004; inferior, p = 0.0052; temporal, p < 0.0001; nasal, p = 0.0001) compared to the MS patients. Parafoveal and peripapillary vessel density was significantly associated with the OCT parameters in both the MS and NMOSD patients. Parafoveal and peripapillary vessel density in the MS patients was significantly associated with visual function, including visual acuity and visual field defects, whereas only peripapillary vessel density was significantly associated with visual function in the NMOSD patients. CONCLUSION We demonstrated parafoveal and peripapillary vascular alterations between MS and NMOSD patients that varied in degree and pattern. We also found associations between vessel density and structural and functional parameters in MS and NMOSD patients. Further studies are needed to facilitate a greater understanding of the pathogenesis and its association with vascular alterations in these disorders.
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Cordon B, Vilades E, Orduna E, Satue M, Perez-Velilla J, Sebastian B, Polo V, Larrosa JM, Pablo LE, Garcia-Martin E. Angiography with optical coherence tomography as a biomarker in multiple sclerosis. PLoS One 2020; 15:e0243236. [PMID: 33290417 PMCID: PMC7723290 DOI: 10.1371/journal.pone.0243236] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 11/18/2020] [Indexed: 11/18/2022] Open
Abstract
PURPOSE To investigate superficial retinal microvascular plexuses detected by optical coherence tomography angiography (OCT-A) in multiple sclerosis (MS) subjects and compare them with healthy controls. METHODS A total of 92 eyes from 92 patients with relapsing-remitting MS and 149 control eyes were included in this prospective observational study. OCT-A imaging was performed using Triton Swept-Source OCT (Topcon Corporation, Japan). The vessel density (VD) percentage in the superficial retinal plexus and optic disc area (6 x 6 mm grid) was measured and compared between groups. RESULTS MS patients showed a significant decrease VD in the superior (p = 0.005), nasal (p = 0.029) and inferior (p = 0.040) parafoveal retina compared with healthy subjects. Patients with disease durations of more than 5 years presented lower VD in the superior (p = 0.002), nasal (p = 0.017) and inferior (p = 0.022) parafoveal areas compared with healthy subjects. Patients with past optic neuritis episodes did not show retinal microvasculature alterations, but patients with an EDSS score of less than 3 showed a significant decrease in nasal (p = 0.024) and superior (p = 0.006) perifoveal VD when compared with healthy subjects. CONCLUSIONS MS produces a decrease in retinal vascularization density in the superficial plexus of the parafoveal retina. Alterations in retinal vascularization observed in MS patients are independent of the presence of optic nerve inflammation. OCT-A has the ability to detect subclinical vascular changes and is a potential biomarker for diagnosing the presence and progression of MS.
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Affiliation(s)
- Beatriz Cordon
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
- * E-mail:
| | - Elisa Vilades
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
| | - Elvira Orduna
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
| | - María Satue
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
| | - Javier Perez-Velilla
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
| | - Berta Sebastian
- National Ocular Pathology Network (OFTARED) at the Carlos III Institute of Health, Madrid, Spain
| | - Vicente Polo
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
- Neurology Department, Miguel Servet University Hospital, Zaragoza, Spain
| | - Jose Manuel Larrosa
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
- Neurology Department, Miguel Servet University Hospital, Zaragoza, Spain
| | - Luis Emilio Pablo
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
- Neurology Department, Miguel Servet University Hospital, Zaragoza, Spain
| | - Elena Garcia-Martin
- Ophthalmology Department, Miguel Servet University Hospital, Zaragoza, Spain
- Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), Aragon Institute for Health Research (IIS Aragon), University of Zaragoza, Zaragoza, Spain
- Neurology Department, Miguel Servet University Hospital, Zaragoza, Spain
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12
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Jiang H, Gameiro GR, Liu Y, Lin Y, Hernandez J, Deng Y, Gregori G, Delgado S, Wang J. Visual Function and Disability Are Associated with Increased Retinal Volumetric Vessel Density in Patients with Multiple Sclerosis. Am J Ophthalmol 2020; 213:34-45. [PMID: 31926161 DOI: 10.1016/j.ajo.2019.12.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 12/12/2022]
Abstract
PURPOSE The goal of this study was to determine the volumetric vessel density (VVD) in the intraretinal layers and its relationship with visual function and disability in patients with multiple sclerosis (MS). DESIGN Cross-sectional study. METHODS A total of 80 patients with relapsing-remitting MS and 99 age- and sex-matched healthy controls (HC) were recruited. The retinal microvascular network in the macular area was imaged using optical coherence tomography angiography in 123 eyes without a history of optic neuritis (ON) (MSNON) and 36 eyes with a history of ON (MSON). The VVD was calculated as the vessel densities in the retinal vascular network (RVN), superficial vascular plexus (SVP), or deep vascular plexus (DVP) of an annulus (0.6-2.5 mm in diameter), divided by the corresponding tissue volume of the intraretinal layers respectively. RESULTS The VVD of RVN and DVP in MSNON were significantly higher than in HC (P < .05). The VVD of RVN, SVP, and DVP in MSON were significantly higher than in MSNON and HC (P < .05). The VVD in both RVN and SVP were positively related to EDSS and disease duration, but negatively related to low-contrast letter acuity (P < .05). The VVD measurements were also negatively and strongly related to the corresponding tissue volumes (P < .05). CONCLUSIONS This is the first study to reveal increased retinal VVD in patients with relapsing-remitting MS. The measurements of VVD in the RVN and SVP were related to disability and visual function, which may be developed as image markers for tracking disease progression.
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13
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Cooperative Three-View Imaging Optical Coherence Tomography for Intraoperative Vascular Evaluation. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8091551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Real-time intraoperative optical coherence tomography (OCT) imaging of blood vessels after anastomosis operation can provide important information the vessel, such as patency, flow speed, and thrombosis morphology. Due to the strong scattering and absorption effect of blood, normal OCT imaging suffers from the problem of incomplete cross-sectional view of the vessel under investigation when the diameter is large. In this work, we present a novel cooperative three-view imaging spectral domain optical coherence tomography system for intraoperative exposed vascular imaging. Two more side views (left view and right view) were realized through a customized sample arm optical design and corresponding mechanical design and fabrication, which could generate cross-sectional images from three circumferential view directions to achieve a larger synthetic field of view (FOV). For each view, the imaging depth was 6.7 mm (in air) and the lateral scanning range was designed to be 3 mm. Therefore, a shared synthetic rectangle FOV of 3 mm × 3 mm was achieved through cooperative three view scanning. This multi-view imaging method can meet the circumferential imaging demands of vessels with an outer diameter less than 3 mm. Both phantom tube and rat vessel imaging confirmed the increased system FOV performance. We believe the intraoperative application of this cooperative three-imaging optical coherence tomography for objective vascular anastomosis evaluation can benefit patient outcomes in the future.
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14
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Deegan AJ, Talebi-Liasi F, Song S, Li Y, Xu J, Men S, Shinohara MM, Flowers ME, Lee SJ, Wang RK. Optical coherence tomography angiography of normal skin and inflammatory dermatologic conditions. Lasers Surg Med 2018; 50:183-193. [PMID: 29356051 DOI: 10.1002/lsm.22788] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/16/2017] [Indexed: 11/09/2022]
Abstract
BACKGROUND In clinical dermatology, the identification of subsurface vascular and structural features known to be associated with numerous cutaneous pathologies remains challenging without the use of invasive diagnostic tools. OBJECTIVE To present an advanced optical coherence tomography angiography (OCTA) method to directly visualize capillary-level vascular and structural features within skin in vivo. METHODS An advanced OCTA system with a 1310 nm wavelength was used to image the microvascular and structural features of various skin conditions. Subjects were enrolled and OCTA imaging was performed with a field of view of approximately 10 × 10 mm. Skin blood flow was identified using an optical microangiography (OMAG) algorithm. Depth-resolved microvascular networks and structural features were derived from segmented volume scans, representing tissue slabs of 0-132, 132-330, and 330-924 μm, measured from the surface of the skin. RESULTS Subjects with both healthy and pathological conditions, such as benign skin lesions, psoriasis, chronic graft-versus-host-disease (cGvHD), and scleroderma, were OCTA scanned. Our OCTA results detailed variations in vascularization and local anatomical characteristics, for example, depth-dependent vascular, and structural alterations in psoriatic skin, alongside their resolve over time; vascular density changes and distribution irregularities, together with corresponding structural depositions in the skin of cGvHD patients; and vascular abnormalities in the nail folds of a patient with scleroderma. CONCLUSION OCTA can image capillary blood flow and structural features within skin in vivo, which has the potential to provide new insights into the pathophysiology, as well as dynamic changes of skin diseases, valuable for diagnoses, and non-invasive monitoring of disease progression and treatment. Lasers Surg. Med. 50:183-193, 2018. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Anthony J Deegan
- Department of Bioengineering, University of Washington, 3720 15th Ave. N.E., Seattle, Washington 98195
| | - Faezeh Talebi-Liasi
- School of Medicine, University of Washington, 1959 N.E. Pacific St., Seattle, Washington 98195
| | - Shaozhen Song
- Department of Bioengineering, University of Washington, 3720 15th Ave. N.E., Seattle, Washington 98195
| | - Yuandong Li
- Department of Bioengineering, University of Washington, 3720 15th Ave. N.E., Seattle, Washington 98195
| | - Jingjiang Xu
- Department of Bioengineering, University of Washington, 3720 15th Ave. N.E., Seattle, Washington 98195
| | - Shaojie Men
- Department of Bioengineering, University of Washington, 3720 15th Ave. N.E., Seattle, Washington 98195
| | - Michi M Shinohara
- Division of Dermatology and Dermatopathology, University of Washington, 1959 N.E. Pacific St., Seattle, Washington 98195
| | - Mary E Flowers
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N., Seattle, Washington 98109
| | - Stephanie J Lee
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N., Seattle, Washington 98109
| | - Ruikang K Wang
- Department of Bioengineering, University of Washington, 3720 15th Ave. N.E., Seattle, Washington 98195
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15
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Feucht N, Maier M, Lepennetier G, Pettenkofer M, Wetzlmair C, Daltrozzo T, Scherm P, Zimmer C, Hoshi MM, Hemmer B, Korn T, Knier B. Optical coherence tomography angiography indicates associations of the retinal vascular network and disease activity in multiple sclerosis. Mult Scler 2018; 25:224-234. [PMID: 29303033 DOI: 10.1177/1352458517750009] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Patients with multiple sclerosis (MS) and clinically isolated syndrome (CIS) may show alterations of retinal layer architecture as measured by optical coherence tomography. Little is known about changes in the retinal vascular network during MS. OBJECTIVE To characterize retinal vessel structures in patients with MS and CIS and to test for associations with MS disease activity. METHOD In all, 42 patients with MS or CIS and 50 healthy controls underwent retinal optical coherence tomography angiography (OCT-A) with analysis of the superficial and deep vascular plexuses and the choriocapillaries. We tested OCT-A parameters for associations with retinal layer volumes, history of optic neuritis (ON), and the retrospective disease activity. RESULTS Inner retinal layer volumes correlated positively with the density of both the superficial and deep vascular plexuses. Eyes of MS/CIS patients with a history of ON revealed reduced vessel densities of the superficial and deep vascular plexuses as compared to healthy controls. Higher choriocapillary vessel densities were associated with ongoing inflammatory disease activity during 24 months prior to OCT-A examination in MS and CIS patients. CONCLUSION Optic neuritis is associated with rarefaction of the superficial and deep retinal vessels. Alterations of the choriocapillaries might be linked to disease activity in MS.
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Affiliation(s)
- Nikolaus Feucht
- Department of Ophthalmology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Mathias Maier
- Department of Ophthalmology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Gildas Lepennetier
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany/ Department of Experimental Neuroimmunology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Moritz Pettenkofer
- Department of Ophthalmology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Carmen Wetzlmair
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Tanja Daltrozzo
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Pauline Scherm
- Department of Ophthalmology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Claus Zimmer
- Department of Neuroradiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Muna-Miriam Hoshi
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Bernhard Hemmer
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany/Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Thomas Korn
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany/ Department of Experimental Neuroimmunology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany/ Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Benjamin Knier
- Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany/ Department of Experimental Neuroimmunology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
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16
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Lanzillo R, Cennamo G, Criscuolo C, Carotenuto A, Velotti N, Sparnelli F, Cianflone A, Moccia M, Brescia Morra V. Optical coherence tomography angiography retinal vascular network assessment in multiple sclerosis. Mult Scler 2017; 24:1706-1714. [DOI: 10.1177/1352458517729463] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background: Optical coherence tomography (OCT) angiography is a new method to assess the density of the vascular networks. Vascular abnormalities are considered involved in multiple sclerosis (MS) pathology. Objective: To assess the presence of vascular abnormalities in MS and to evaluate their correlation to disease features. Methods: A total of 50 MS patients with and without history of optic neuritis (ON) and 46 healthy subjects were included. All underwent spectral domain (SD)-OCT and OCT angiography. Clinical history, Expanded Disability Status Scale (EDSS), Multiple Sclerosis Severity Score (MSSS) and disease duration were collected. Results: Angio-OCT showed a vessel density reduction in eyes of MS patients when compared to controls. A statistically significant reduction in all SD-OCT and OCT angiography parameters was noticed both in eyes with and without ON when compared with control eyes. We found an inverse correlation between SD-OCT parameters and MSSS ( p = 0.003) and between vessel density parameters and EDSS ( p = 0.007). Conclusion: We report a vessel density reduction in retina of MS patients. We highlight the clinical correlation between vessel density and EDSS, suggesting that angio-OCT could be a good marker of disease and of disability in MS.
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Affiliation(s)
- Roberta Lanzillo
- Multiple Sclerosis Center, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Gilda Cennamo
- Eye Clinic, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Chiara Criscuolo
- Multiple Sclerosis Center, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Antonio Carotenuto
- Multiple Sclerosis Center, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Nunzio Velotti
- Eye Clinic, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Federica Sparnelli
- Eye Clinic, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Alessandra Cianflone
- Multiple Sclerosis Center, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Marcello Moccia
- Multiple Sclerosis Center, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
| | - Vincenzo Brescia Morra
- Multiple Sclerosis Center, Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Naples, Italy
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17
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Cheung CYL, Ikram MK, Chen C, Wong TY. Imaging retina to study dementia and stroke. Prog Retin Eye Res 2017; 57:89-107. [PMID: 28057562 DOI: 10.1016/j.preteyeres.2017.01.001] [Citation(s) in RCA: 161] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 11/07/2016] [Accepted: 01/01/2017] [Indexed: 02/07/2023]
Abstract
With increase in life expectancy, the number of persons suffering from common age-related brain diseases, including neurodegenerative (e.g., dementia) and cerebrovascular (e.g., stroke) disease is expected to rise substantially. As current neuro-imaging modalities such as magnetic resonance imaging may not be able to detect subtle subclinical changes (resolution <100-500 μm) in dementia and stroke, there is an urgent need for other complementary techniques to probe the pathophysiology of these diseases. The retina - due to its anatomical, embryological and physiological similarities with the brain - offers a unique and accessible "window" to study correlates and consequences of subclinical pathology in the brain. Retinal components such as the microvasculature and retinal ganglion cell axons can now be visualized non-invasively using different retinal imaging techniques e.g., ocular fundus photography and optical coherence tomography. Advances in retinal imaging may provide new and potentially important insights into cerebrovascular neurodegenerative processes in addition to what is currently possible with neuro-imaging. In this review, we present an overview of the current literature on the application of retinal imaging in the study of dementia and stroke. We discuss clinical implications of these studies, novel state-of-the-art retinal imaging techniques and future directions aimed at evaluating whether retinal imaging can be an additional investigation tool in the study of dementia and stroke.
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Affiliation(s)
- Carol Yim-Lui Cheung
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong.
| | - M Kamran Ikram
- Duke-NUS Graduate Medical School, National University of Singapore, Singapore; Departments of Neurology & Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Christopher Chen
- Memory Aging and Cognition Centre, National University Health System, Singapore; Department of Pharmacology, National University of Singapore, Singapore
| | - Tien Yin Wong
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore; Duke-NUS Graduate Medical School, National University of Singapore, Singapore
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18
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Dietrich M, Cruz-Herranz A, Yiu H, Aktas O, Brandt AU, Hartung HP, Green A, Albrecht P. Whole-body positional manipulators for ocular imaging of anaesthetised mice and rats: a do-it-yourself guide. BMJ Open Ophthalmol 2016; 1:e000008. [PMID: 29354694 PMCID: PMC5759402 DOI: 10.1136/bmjophth-2016-000008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 09/27/2016] [Indexed: 11/10/2022] Open
Abstract
Background In vivo retinal imaging of rodents has gained a growing interest in ophthalmology and neurology. The bedding of the animals with the possibility to perform adjustments in order to obtain an ideal camera-to-eye angle is challenging. Methods We provide a guide for a cost-effective, do-it-yourself rodent holder for ocular imaging techniques. The set-up was tested and refined in over 2000 optical coherence tomography measurements of mice and rats. Results The recommended material is very affordable, readily available and easily assembled. The holder can be adapted to both mice and rats. A custom-made mouthpiece is provided for the use of inhalant anaesthesia. The holder is highly functional and assures that the rodent’s eye is the centre of rotation for adjustments in both the axial and the transverse planes with a major time benefit over unrestrained positioning of the rodents. Conclusion We believe this guide is very useful for eye researchers focusing on in vivo retinal imaging in rodents as it significantly reduces examination times for ocular imaging.
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Affiliation(s)
- Michael Dietrich
- Department of Neurology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Andrés Cruz-Herranz
- Department of Neurology, University of California, San Francisco, San Francisco, California, United States
| | - Hao Yiu
- Department of Neurology, University of California, San Francisco, San Francisco, California, United States
| | - Orhan Aktas
- Department of Neurology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Alexander U Brandt
- NeuroCure Clinical Research Center, Charite-Universitätsmedizin Berlin, Berlin, Germany
| | - Hans-Peter Hartung
- Department of Neurology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Ari Green
- Department of Neurology, University of California, San Francisco, San Francisco, California, United States
| | - Philipp Albrecht
- Department of Neurology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
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