scholarly journals The application of optical coherence tomography angiography in Alzheimer's disease: A systematic review

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Olivia M. Rifai ◽  
Sarah McGrory ◽  
Cason B. Robbins ◽  
Dilraj S. Grewal ◽  
Andy Liu ◽  
...  
Keyword(s):  
Systematic Review ◽  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence

Optical coherence tomography angiography in Alzheimer’s disease: a systematic review and meta-analysis

Eye ◽  
2021 ◽  
Author(s):  
Andreas Katsimpris ◽  
Aristotelis Karamaounas ◽  
Anna Maria Sideri ◽  
John Katsimpris ◽  
Ilias Georgalas ◽  
...  
Keyword(s):  
Systematic Review ◽  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Meta Analysis ◽  
Optical Coherence

Evaluation of Ocular Perfusion in Alzheimer’s Disease Using Optical Coherence Tomography Angiography

2018 ◽  
Vol 66 (4) ◽  
pp. 1745-1752 ◽  
Author(s):  
Larissa Lahme ◽  
Eliane Luisa Esser ◽  
Natasa Mihailovic ◽  
Friederike Schubert ◽  
Jost Lauermann ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence ◽  
Ocular Perfusion

scholarly journals Optical coherence tomography angiography in preclinical Alzheimer’s disease

2019 ◽  
Vol 104 (2) ◽  
pp. 157-161 ◽  
Author(s):  
Jacoba Alida van de Kreeke ◽  
Hoang-Ton Nguyen ◽  
Elles Konijnenberg ◽  
Jori Tomassen ◽  
Anouk den Braber ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Vessel Density ◽  
Binding Potential ◽  
Continuous Measure ◽  
Optical Coherence ◽  
Mz Twins ◽  
The Brain

Background/aimsAs a protrusion from the brain, the retina might reflect the status of the brain. Previous studies showed a decrease in vessel density and foveal avascular zone (FAZ) enlargement on optical coherence tomography angiography (OCTA) in individuals suffering from Alzheimer’s disease (AD). This study aims to assess whether such changes are already present in preclinical stages of AD, in a population of monozygotic (MZ) twins.Methods124 cognitively healthy individuals (MZ twins, ages 60–93 years) underwent [18F]flutemetamol amyloid positron emission tomography (PET) scanning and OCTA. PET scans were visually rated for cortical amyloid-beta (Aβ) positivity. Parametric global cortical non-displaceable binding potential (BPND) was used as a continuous measure for Aβ aggregation. FAZ size and vessel densities for the inner and outer ring of the macular ETDRS grid and in a 3–6 mm ring around the optic nerve head (ONH) were measured.OCTA measures were associated with visual Aβ score,BPNDand amyloid load estimated by twin concordance on visual Aβ score. Twin correlations were estimated as a measure of maximum heritability of OCTA measures.Results13 of 124 participants were Aβ+. Aβ+ individuals had significantly higher vessel density than Aβ– individuals in all regions but did not differ in FAZ size. Twin analyses showed a positive association between and vessel densities in all regions.BPNDtended to be associated with higher vessel density in the inner ring. Twin correlations were moderate/high for all OCTA parameters except vessel density around the ONH, which correlated weakly.ConclusionRetinal vessel density was higher in individuals with preclinical AD.

The Retinal Vessel Density Can Reflect Cognitive Function in Patients with Alzheimer’s Disease: Evidence from Optical Coherence Tomography Angiography

2021 ◽  
pp. 1-10
Author(s):  
Yibing Yan ◽  
Xingqi Wu ◽  
Xiaojing Wang ◽  
Zhi Geng ◽  
Lu Wang ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Cognitive Function ◽  
Layer Thickness ◽  
Optical Coherence Tomography Angiography ◽  
Vessel Density ◽  
Retinal Layer ◽  
Optical Coherence ◽  
Visual Spatial

Background: There is increasing evidence that Alzheimer’s disease (AD) patients may present decreased cerebral blood perfusion before pathological brain changes. Using the retina as a window to the brain, we can study disorders of the central nervous system through the eyes. Objective: This study aimed to investigate differences in retinal structure and vessel density (VD) between patients with mild AD and healthy controls (HCs). Furthermore, we explored the relationship between retinal VD and cognitive function. Methods: We enrolled 37 patients with AD and 29 age-matched HCs who underwent standard ophthalmic optical coherence tomography angiography (OCTA) for evaluation of the retinal layer thickness and VD parameters. Cognitive function was evaluated using a battery of neuropsychological assessments. Finally, the correlations among retinal layer thickness, VD parameters, and cognitive function were evaluated. Results: The retinal fiber layer thickness and retinal VD of patients with AD were significantly reduced compared with HCs. The retinal VD was significantly correlated with overall cognition, memory, executive, and visual-spatial perception functions. However, there was no significant between-group difference in the macular thickness. Conclusion: Our findings indicate a positive correlation between retinal VD and some, but not all, cognitive function domains. Most importantly, we demonstrated the role of OCTA in detecting early capillary changes, which could be a noninvasive biomarker for early AD.

scholarly journals Detection of retinal changes with optical coherence tomography angiography in mild cognitive impairment and Alzheimer’s disease patients: A meta-analysis

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0255362
Author(s):  
Jingwen Hui ◽  
Yun Zhao ◽  
Shasha Yu ◽  
Jinfeng Liu ◽  
Kin Chiu ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Optical Coherence Tomography Angiography ◽  
Meta Analysis ◽  
Optical Coherence ◽  
Retinal Microvasculature ◽  
Capillary Plexus

Objective To assess retinal microvascular network impairments in the eyes of mild cognitive impairment (MCI) and Alzheimer’s disease (AD) patients with optical coherence tomography angiography (OCTA). Design Systematic review and meta-analysis. Methods A literature search was conducted in the PubMed and EMBASE databases to identify relevant studies detecting retinal microvascular attenuation among AD, MCI patients and cognitively healthy controls (HCs) by OCTA. Data were extracted by Review Manager V.5.4 and Stata V.14.0. Results Eight investigations were included in this meta-analysis, with 150 AD patients, 195 MCI patients and 226 HCs were eligible for meta-analysis. Evidence based on these studies demonstrated that there was a significantly decreased vessel density (VD) of the Optovue group in superficial capillary plexus (SCP): WMD = -2.26, 95% CI: -3.98 to -0.55, p = 0.01; in deep capillary plexus (DCP): WMD = -3.40, 95% CI: -5.99 to -0.81, p = 0.01, VD of the Zeiss group in SCP:WMD = -0.91, 95% CI: -1.79 to -0.02, p = 0.05 and an enlarged fovea avascular zone (FAZ):WMD = 0.06, 95% CI: 0.01 to 0.11, P = 0.02 in OCTA measurements of MCI patients. Additionally, in OCTA measurements of AD patients, there was a significantly decreased VD in the SCP: WMD = -1.88, 95% CI: -2.7 to -1.07, p<0.00001. In contrast, there was no significant decrease in DCP nor enlargement of FAZ in AD patients. Conclusion Retinal microvascular alternations could be optimally screened in MCI patients detected by OCTA, which could be a warning sign of relative changes in the MCI before progressing to AD. Retinal microvasculature changes worth further investigation in larger scale clinical trials.

scholarly journals Decreased Retinal Vascular Density in Alzheimer’s Disease (AD) and Mild Cognitive Impairment (MCI): An Optical Coherence Tomography Angiography (OCTA) Study

2021 ◽  
Vol 12 ◽  
Author(s):  
Xi Wang ◽  
Qianhua Zhao ◽  
Rui Tao ◽  
Huimeng Lu ◽  
Zhenxu Xiao ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Optical Coherence Tomography ◽  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Patient Group ◽  
Optical Coherence Tomography Angiography ◽  
Vascular Density ◽  
Optical Coherence ◽  
Patient Groups

BackgroundTo explore the retinal vascular density changes in Alzheimer’s disease (AD) and mild cognitive impairment (MCI) patients using optical coherence tomography angiography (OCTA).MethodsWe recruit 62 AD patients, 47 MCI patients, and 49 cognitively healthy controls (HC) in this study. All participants in the study received a comprehensive ophthalmological and neurological evaluation, including global cognitive screening, as well as the Mini-Mental State Examination (MMSE), and completed the following eye examinations: visual acuity (VA), intraocular pressure (IOP), examination with slit-lamp, fundus photography (Version 1.5.0.0, NIDEK CO, LTD) and Optical coherence tomography imaging (software ReVue version 2017.1.0.155, Optovue Inc., Fremont, CA, United States). The visual rating scales for atrophy and white matter lesion in MRI was evaluated for all the patients with AD and MCI.ResultsIn the AD patient group, the superficial vascular density in the superior, inferior and whole retina was 44.64 ± 3.34, 44.65 ± 3.55, and 44.66 ± 3.36, respectively. These values were 44.24 ± 3.15, 43.72 ± 3.16, and 44 ± 3.07, respectively, in the MCI patient group. After multivariate analysis of the generalized linear model, adjustments for the confounding factors of sex, age, hypertension, diabetes and the quality index of OCTA image, the superficial vascular density in the AD and MCI patient groups was significantly lower than that in the HC group (P &lt; 0.05): 46.94 ± 2.04, 46.67 ± 2.26, and 46.82 ± 2.08, respectively. No difference in the area of the FAZ among the three groups was observed (AD group: 0.34 ± 0.11 mm2; MCI group: 0.36 ± 0.12 mm2; control group: 0.33 ± 0.12 mm2, p &gt; 0.05). The ganglion cell complex (GCC) thickness, inner parafovea thickness, and peripapillary retinal nerve fiber layer (p-RNFL) thickness were associated with the superficial vascular density. We found no significant correlation between the global cognition (MMSE scores) or between the Fazekas score and retinal OCT angiogram flow density.ConclusionThe superficial vascular density in the AD and MCI patient groups was significantly lower than that in the HC group. Our findings suggest the retinal microvascular dysfunction occurred in MCI and AD.

scholarly journals Diagnostic value of optical coherence tomography angiography for choroidal neovascularization in age-related macular degeneration: A systematic review and meta-analysis

2020 ◽  
Author(s):  
Chang-Xi Chen ◽  
Mei-Ling Liu ◽  
Kai Cao ◽  
Mayinuer Yusufu ◽  
Jin-Da Wang
Keyword(s):  
Systematic Review ◽  
Optical Coherence Tomography ◽  
Macular Degeneration ◽  
Choroidal Neovascularization ◽  
Optical Coherence Tomography Angiography ◽  
Meta Analysis ◽  
Diagnostic Value ◽  
Age Related Macular Degeneration ◽  
Optical Coherence ◽  
Classification Rate

Objective: To evaluate the diagnostic value of optical coherence tomography angiography (OCTA) in detecting the choroidal neovascularization (CNV) in agerelated macular degeneration (AMD). Methods: A systematic review and meta-analysis was performed by searching Pubmed, Science Direct, Embase and Web of Science. The pooled sensitivity and specificity with 95% confidence intervals (CIs), area under the summary receiver operator characteristic curve (sROC), and the total accurate classification rate were used to evaluate OCTA’ diagnostic value of CNV in AMD patients. Results: Seven studies involving 517 eyes were included in the analysis. The mean age of subjects in each study ranged from 58.5 years to 81.7 years. Fluorescein angiography was applied as the gold standard in five studies. There were 350 eyes diagnosed with CNV, OCTA detected 301 eyes correctly, while among the 167 eyes without CNV, OCTA identified 150 correctly. The total accurate classification rate was 87.23%. The Spearman's rank correlation coefficient was 0.5, indicating that there was no significant threshold effect in the current study (S=8, p=0.103). The pooled sensitivity and pooled specificity were 0.89 (95%CI: 0.82,0.94) and 0.96 (95%CI: 0.85,1.00) respectively. The area under sROC was up to 0.911. Conclusion: The specificity of OCTA for the detection of CNV in AMD patients is extremely high, however, the sensitivity still needs to be improved. In general, the metaanalysis revealed that OCTA had a high diagnostic value for the detection of CNV in AMD patients.

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