Retinal blood flow in response to an intravitreal injection of ranibizumab for neovascular age-related macular degeneration

It is well-known that age-related macular degeneration is the main cause of visual impairment in industrialised countries affecting around 239,000 people in UK while demonstrating an increasing trend. Fluorescein angiography is the most widely used technique in the diagnosis, prognosis and in following up the development of the disease. The interpretation of fluorescein angiograms depends upon the detection of abnormal fluorescence and clinical assessment of the functional integrity of retinal circulation, which is primarily based on subjective evaluation of the dye transit-time. This study presents a prototype system for quantitative analysis of the retinal haemodynamics. It analyses retinal blood flow based on the estimation of parameters such as mean transit-time, arteriovenous passage time and mean dye velocity. These parameters are estimated using densitometry and analysis of the vascular response. The prototype system consists of three main stages: vessel segmentation, image registration and blood flow estimation. The performance of the system is demonstrated on a comprehensive dataset, which contains images of normal retinas and retinas with pathologies such as wet age-related macular degeneration and branch retinal vein occlusion. The presented framework aims to demonstrate the technical feasibility for automated extraction of retinal blood flow parameters and contributes towards the development of a clinically proven computer vision system for quantitative analysis of fluorescein angiograms to assist NHS clinicians in the early diagnosis of age-related macular degeneration.

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Morphofunctional analysis of the macular zone after intravitreal injection of aflibercept in neovascular form age-related macular degeneration

Modern technologies in ophtalmology ◽

10.25276/2312-4911-2020-1-204-208 ◽

2020 ◽

pp. 204-208

Author(s):

Е.V. Udovichenko ◽

◽

L.P. Emanova ◽

V.V. Egorov ◽

G.P. Smoliakova ◽

...

Keyword(s):

Macular Degeneration ◽

Intravitreal Injection ◽

Age Related Macular Degeneration ◽

Age Related ◽

Morphofunctional Analysis

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Incidence of elevated intraocular pressure after intravitreal injection in Japanese patients with age-related macular degeneration

Scientific Reports ◽

10.1038/s41598-021-91832-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Maiko Maruyama-Inoue ◽

Tatsuya Inoue ◽

Shaheeda Mohamed ◽

Yoko Kitajima ◽

Shoko Ikeda ◽

...

Keyword(s):

Risk Factors ◽

Intraocular Pressure ◽

Macular Degeneration ◽

Intravitreal Injection ◽

Odds Ratio ◽

Japanese Patients ◽

Age Related Macular Degeneration ◽

Age Related ◽

Elevated Intraocular Pressure ◽

History Of

AbstractThe purpose of this study was to report the incidence of elevated intraocular pressure (IOP) after intravitreal injection (IVI) of anti-vascular endothelial growth factor (VEGF) in Japanese patients with age-related macular degeneration (AMD). A retrospective study of chart review of patients who underwent ≥ 10 intravitreal anti-VEGF injections between April 2009 and December 2019 was conducted. Elevated IOP was defined as IOP ≥ 25 mmHg at one visit. Cases with elevated IOP resulting from IVI were identified. Furthermore, the association between elevated IOP and some parameters, as the risk factors that influence elevated IOP, was investigated. A total of 402 eyes of 370 patients were included in this study. Twenty-eight eyes of 26 patients (7.0%) were identified as cases with elevated IOP after IVI. The mean time of elevation after baseline was 50.6 ± 26.5 months. History of glaucoma (p = 0.021; odds ratio, 5.85), treatment modality (p = 0.019; odds ratio, 6.32), and total number of injections (p = 0.003; odds ratio, 1.03) were significantly associated with elevated IOP. A late complication of elevated IOP is associated with IVI in patients with AMD. Particularly, history of glaucoma and treat and extend regimen with frequent injections were found to be risk factors of elevated IOP.

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