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Retinal vascular calibre

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https://www.readbyqxmd.com/read/29449598/health-related-quality-of-life-in-adolescents-and-the-retinal-microvascular-structure
#1
Bamini Gopinath, Gerald Liew, George Burlutsky, Louise A Baur, Paul Mitchell
We aimed to investigate whether health-related quality of life (HRQoL) is associated with retinal vascular caliber, an indicator of subclinical cardiovascular disease risk. 1600 students aged between 11-19 years (821 girls and 779 boys) were examined during 2009-2011. Retinal vessel caliber was measured from digital retinal images. HRQoL was assessed by the Pediatric Quality of Life Inventory (PedsQL). In the overall cohort, each 1-unit increase in PedsQL total score and the psychosocial summary score was associated with ~0...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29396691/the-adolescent-cardio-renal-intervention-trial-addit-retinal-vascular-geometry-and-renal-function-in-adolescents-with-type-1-diabetes
#2
Paul Z Benitez-Aguirre, Tien Y Wong, Maria E Craig, Elizabeth A Davis, Andrew Cotterill, Jennifer J Couper, Fergus J Cameron, Farid H Mahmud, Tim W Jones, Lauren A B Hodgson, R Neil Dalton, David B Dunger, Kim C Donaghue
AIMS/HYPOTHESIS: We examined the hypothesis that elevation in urinary albumin creatinine ratio (ACR) in adolescents with type 1 diabetes is associated with abnormal retinal vascular geometry (RVG) phenotypes. METHODS: A cross-sectional study at baseline of the relationship between ACR within the normoalbuminuric range and RVG in 963 adolescents aged 14.4 ± 1.6 years with type 1 diabetes (median duration 6.5 years) screened for participation in AdDIT. A validated algorithm was used to categorise log10 ACR into tertiles: upper tertile ACR was defined as 'high-risk' for future albuminuria and the lower two tertiles were deemed 'low-risk'...
February 2, 2018: Diabetologia
https://www.readbyqxmd.com/read/29363532/automated-diabetic-retinopathy-detection-using-optical-coherence-tomography-angiography-a-pilot-study
#3
Harpal Singh Sandhu, Nabila Eladawi, Mohammed Elmogy, Robert Keynton, Omar Helmy, Shlomit Schaal, Ayman El-Baz
BACKGROUND: Optical coherence tomography angiography (OCTA) is increasingly being used to evaluate diabetic retinopathy, but the interpretation of OCTA remains largely subjective. The purpose of this study was to design a computer-aided diagnostic (CAD) system to diagnose non-proliferative diabetic retinopathy (NPDR) in an automated fashion using OCTA images. METHODS: This was a two-centre, cross-sectional study. Adults with type II diabetes mellitus (DMII) were eligible for inclusion...
January 23, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29193789/temporal-changes-in-retinal-vascular-parameters-associated-with-successful-panretinal-photocoagulation-in-proliferative-diabetic-retinopathy-a-prospective-clinical-interventional-study
#4
Thomas Lee Torp, Ryo Kawasaki, Tien Yin Wong, Tunde Peto, Jakob Grauslund
PURPOSE: We aimed to investigate changes in retinal vascular geometry over time after panretinal photocoagulation (PRP) in patients with proliferative diabetic retinopathy (PDR). METHODS: Thirty-seven eyes with PDR were included. Wide-field fluorescein angiography (Optomap, Optos PLC., Dunfermline, Scotland, UK) was used to diagnose PDR at baseline and to assess activity at follow-up month three and six. At each time-point, a trained grader measured retinal vessel geometry on optic disc (OD) centred images using semiautomated software (SIVA, Singapore I Vessel Assessment, National University of Singapore, Singapore) according to a standardized protocol...
November 29, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29050745/a-spectrum-of-retinal-vasculature-measures-and-coronary-artery-disease
#5
Sarah B Wang, Paul Mitchell, Gerald Liew, Tien Yin Wong, Kevin Phan, Aravinda Thiagalingam, Nichole Joachim, George Burlutsky, Bamini Gopinath
BACKGROUND AND AIMS: We aimed to comprehensively describe a spectrum of retinal vessel measures including fractal dimension (Df) and their associations with indices of coronary artery disease (CAD) extent and severity, as well as hypertension and diabetes. METHODS: The Australian Heart Eye Study (AHES) is an observational study that surveyed 1680 participants presenting to a tertiary referral hospital for the evaluation of potential CAD by coronary angiography. A range of newer retinal vessel geometric measures (Df, curvature tortuosity, and branching angle) were quantified from retinal photographs using semi-automated software, the Singapore 'I' Vessel Assessment (SIVA) tool...
October 10, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/29040166/measurement-of-retinal-vessels-as-a-biomarker-of-cerebrovascular-ageing-in-older-hiv-positive-men-compared-to-controls
#6
Lewis Haddow, Rosanna Laverick, Irene Leung, Frank Post, Jaime Vera, Richard Gilson, Ian Williams, Marta Boffito, Caroline Sabin, Alan Winston, Tunde Peto
BACKGROUND: To compare retinal vascular measurements, biomarkers of cerebral small vessel disease (SVD), in HIV positive men aged 50 years and above with similarly-aged HIV negative men and younger HIV positive men. METHODS: We recruited white, non-diabetic men to a cross-sectional substudy of a larger cohort including three demographically-matched groups. Optic disc centred 45° colour fundus photographs were used to calculate central retinal arterial and venous calibre and the arterial-venous ratio (AVR)...
October 14, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28931409/clinical-review-of-24-35%C3%A2-year-olds-conceived-with-and-without-in-vitro-fertilization-study-protocol
#7
Sharon Lewis, Joanne Kennedy, David Burgner, Robert McLachlan, Sarath Ranganathan, Karin Hammarberg, Richard Saffery, David J Amor, Michael M H Cheung, Lex W Doyle, Markus Juonala, Susan Donath, John McBain, Jane Halliday
BACKGROUND: Children conceived by assisted reproductive technologies (ART) currently comprise 4% of Australian births. The manipulation of biological parameters related to fertilization and implantation are integral to successful ART but potentially pose a risk to the longer-term health of the offspring. There is consensus that many common adult health problems (particularly cardiovascular, metabolic and respiratory conditions) have their origins in early life, possibly before birth, and that risk trajectories track through childhood until clinical disease manifests in adulthood...
September 20, 2017: Reproductive Health
https://www.readbyqxmd.com/read/28839244/retinal-vascular-imaging-markers-and-incident-chronic-kidney-disease-a-prospective-cohort-study
#8
Wanfen Yip, Peng Guan Ong, Boon Wee Teo, Carol Yim-Lui Cheung, E Shyong Tai, Ching-Yu Cheng, Ecosse Lamoureux, Tien Yin Wong, Charumathi Sabanayagam
Retinal microvascular changes indicating microvascular dysfunction have been shown to be associated with chronic kidney disease (CKD) in cross-sectional studies, but findings were mixed in prospective studies. We aimed to evaluate the relationship between retinal microvascular parameters and incident CKD in an Asian population. We examined 1256 Malay adults aged 40-80 years from the Singapore Malay Eye Study, who attended both the baseline (2004-07) and the follow-up (2011-13) examinations and were free of prevalent CKD...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28711971/innovative-technology-shows-impact-of-glycaemic-control-on-peripheral-retinal-vessels-in-adolescents-with-type-1-diabetes
#9
Valli Velayutham, Paul Z Benitez-Aguirre, Maria E Craig, Gerald Liew, Tien Y Wong, Alicia J Jenkins, Kim C Donaghue
AIMS/HYPOTHESIS: Retinal imaging enables non-invasive microvasculature assessment; however, only central retinal vessels have been studied in type 1 diabetes. Peripheral smaller vessels have a major haemodynamic role and may differ from central vessels in their response to the diabetic milieu. We hypothesise that diabetes has a greater impact on peripheral retinal vessels vs central vessels. METHODS: Retinal photographs from adolescents (n = 736; age 12-20 years) with type 1 diabetes were graded (Singapore I Vessel Assessment) with vessel calibres measured in the 'central zone' as central retinal arteriolar and venular equivalents (CRAE and CRVE, respectively) and the 'extended zone' as mean width of arterioles and venules (MWa and MWv, respectively)...
October 2017: Diabetologia
https://www.readbyqxmd.com/read/28623387/retinal-vascular-geometry-and-6%C3%A2-year-incidence-and-progression-of-diabetic-retinopathy
#10
Carol Yim-Lui Cheung, Charumathi Sabanayagam, Antony Kwan-Pui Law, Neelam Kumari, Daniel Shu-Wei Ting, Gavin Tan, Paul Mitchell, Ching Yu Cheng, Tien Yin Wong
AIMS/HYPOTHESIS: We aimed to examine prospectively the association between a range of retinal vascular geometric variables measured from retinal photographs and the 6 year incidence and progression of diabetic retinopathy. METHODS: We conducted a prospective, population-based cohort study of Asian Malay individuals aged 40-80 years at baseline (n = 3280) who returned for a 6 year follow-up. Retinal vascular geometric variables (tortuosity, branching, fractal dimension, calibre) were measured from baseline retinal photographs using a computer-assisted program (Singapore I Vessel Assessment)...
June 16, 2017: Diabetologia
https://www.readbyqxmd.com/read/28446234/retinal-vessel-diameters-and-reactivity-in-diabetes-mellitus-and-or-cardiovascular-disease
#11
R Heitmar, G Y H Lip, R E Ryder, A D Blann
BACKGROUND: Retinal vessel calibre and vascular dilation/constriction in response to flicker light provocation may provide a measure distinguishing patients suffering from diabetes mellitus and/or cardiovascular disease. METHODS: One hundred and sixteen age and sex matched patients with diabetes mellitus (DM), cardiovascular disease (CVD) and both DM and CVD (DM + CVD) underwent systemic and intraocular pressure measurements. Retinal vessel calibres were assessed using a validated computer-based program to compute central retinal artery and vein equivalents (CRVE) from monochromatic retinal images...
April 26, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28317946/serum-lipid-profiles-and-dyslipidaemia-are-associated-with-retinal-microvascular-changes-in-children-and-adolescents
#12
Wei Xiao, Xinxing Guo, Xiaohu Ding, Mingguang He
The present study aims to assess the relationship between serum lipid parameters and retinal microvascular calibres in children and adolescents. A total of 950 participants aged 7 to 19 years were recruited. Central retinal arteriolar equivalent (CRAE) and central retinal venular equivalent (CRVE) were measured from digital retinal images. Serological testing was performed to obtain lipid profiles. Dyslipidaemia was defined according to the US national expert panel guideline. After adjusted for age, sex, mean arterial blood pressure, axial length, body mass index and the fellow retinal vascular calibre, no significant association was found between retinal vascular diameters and any lipid parameters (all P > 0...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28228411/retinal-vascular-calibre-changes-after-intravitreal-bevacizumab-or-dexamethasone-implant-treatment-for-diabetic-macular-oedema
#13
RANDOMIZED CONTROLLED TRIAL
Sanjeewa S Wickremasinghe, Samantha Fraser-Bell, Elizabeth Alessandrello, Hemal Mehta, Mark C Gillies, Lyndell L Lim
PURPOSE: To compare changes in retinal vascular calibre after 2 years of treatment with intravitreal bevacizumab (BVZ) or dexamethasone implant (DEX) in patients with centre-involving diabetic macular oedema (DMO). METHODS: At baseline, 88 eyes of 61 patients with DMO were recruited in a prospective, multicentre, randomised, single-masked clinical trial. Of these subjects, 22 BVZ-treated (52%) and 22 DEX-treated (48%) eyes of 34 patients (56%) had gradable retinal photographs at both the baseline and 24-month visits...
October 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28222036/vascular-risk-factors-are-associated-with-retinal-arteriolar-narrowing-and-venular-widening-in-children-and-adolescents-with-type-1-diabetes
#14
Stuart Keel, Catherine Itsiopoulos, Konstandina Koklanis, Meri Vukicevic, Fergus Cameron, Laima Brazionis
BACKGROUND: The aim of the study was to describe the relationship of retinal arteriolar and venular calibre with vascular risk factors in children and adolescents with type 1 diabetes. METHODS: In this hospital-based cross-sectional study, the medical files of 483 children and adolescents with type 1 diabetes were audited to collect retinal images and relevant clinical data. Retinal vascular calibre was measured using standardised protocols. RESULTS: After multivariable adjustments, a vascular risk profile that included: older age, higher serum creatinine, higher systolic blood pressure (SBP), higher body mass index (BMI), abnormal estimated glomerular filtration rate (eGFR), lower high-density lipoproteins (HDL) cholesterol, longer duration of diabetes and higher serum sodium was associated with narrower central retinal artery equivalent (CRAE) (95% CI=-4...
March 1, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/27704165/the-teto-rat-as-a-new-translational-model-for-type-2-diabetic-retinopathy-by-inducible-insulin-receptor-knockdown
#15
Nadine Reichhart, Sergio Crespo-Garcia, Nadine Haase, Michaela Golic, Sergej Skosyrski, Anne Rübsam, Christina Herrspiegel, Norbert Kociok, Natalia Alenina, Michael Bader, Ralf Dechend, Olaf Strauss, Antonia M Joussen
AIMS/HYPOTHESIS: Although the renin-angiotensin system plays an important role in the progression of diabetic retinopathy, its influence therein has not been systematically evaluated. Here we test the suitability of a new translational model of diabetic retinopathy, the TetO rat, for addressing the role of angiotensin-II receptor 1 (AT1) blockade in experimental diabetic retinopathy. METHODS: Diabetes was induced by tetracycline-inducible small hairpin RNA (shRNA) knockdown of the insulin receptor in rats, generating TetO rats...
January 2017: Diabetologia
https://www.readbyqxmd.com/read/27508392/the-impact-of-macronutrients-on-retinal-microvasculature-among-singapore-pregnant-women-during-the-mid-late-gestation
#16
Ling-Jun Li, Peng Guan Ong, Marjorelee T Colega, Chad Yixian Han, Ling Wei Chen, Ryan Man Eyn Kidd, Ecosse Lamoureux, Peter Gluckman, Kenneth Kwek, Yap Seng Chong, Seang Mei Saw, Keith M Godfrey, Tien Yin Wong, Mary Chong Foong-Fong
BACKGROUND: Imbalanced macronutrient intakes can induce impairment of endothelial and vascular function, and further lead to metabolic and cardiovascular disease. However, little is known about the influence of such diets on endothelial and vascular dysfunction in pregnant women, even though high-fat diet is a known risk for pregnancy complications such as gestational diabetes and pre-eclampsia. OBJECTIVE: We aimed to assess the association between maternal macronutrient intakes (protein, fat and carbohydrates), dietary quality and retinal microvascular changes in a multi-ethnic Asian mother-offspring cohort...
2016: PloS One
https://www.readbyqxmd.com/read/27494951/assessment-of-retinal-vascular-calibres-as-a-biomarker-of-disease-activity-in-birdshot-chorioretinopathy
#17
Rupesh Agrawal, Nichole Joachim, Ling-Jun Li, Jiaying Lee, Aniruddha Agarwal, Dawn A Sim, Pearse A Keane, Gerald Liew, Carlos E Pavesio
PURPOSE: Birdshot chorioretinopathy (BCR) is a potentially blinding ocular disorder involving the retinal vasculature and choroid without any systemic manifestations. The objective of the study was to describe vascular calibre changes in BCR and analyse the possibility of this optical biomarker for staging and monitoring disease activity in BCR. METHODS: This retrospective case-control study at a tertiary referral eye centre in the UK included 33 eyes from 21 patients with BCR and equal number of eyes from control subjects...
March 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27492729/surgically-induced-changes-in-retinal-vessel-diameter-retinal-nerve-fibre-layer-thickness-and-the-optic-disc-after-23-gauge-pars-plana-vitrectomy
#18
Seung Uk Lee, Ki Yup Nam, Sang Joon Lee
The aim of the study is to investigate the retinal vascular calibre, retinal nerve fibre layer's thickness, and optic disc changes in patients after pars plana vitrectomy. We examined 40 eyes in 40 patients who had undergone unilateral pars plana vitrectomy at three time points: prior to surgery, and at 3 and 6 months after the operation. The diameters of central retinal arteries and veins were measured using retinal photographs. The central retinal arteriolar equivalent (CRAE) and central retinal venular equivalent (CRVE) were calculated using the revised Parr-Hubbard formula...
June 2017: International Ophthalmology
https://www.readbyqxmd.com/read/27150159/review-of-paediatric-retinal-microvascular-changes-as-a-predictor-of-cardiovascular-disease
#19
REVIEW
Alexander R Newman, Nicholas H Andrew, Robert J Casson
Recent studies have supported the hypothesis that exposure to established cardiovascular risk factors in early life predisposes to the development of adult cardiovascular disease. Retinal imaging is an emerging technique which facilitates non-invasive, accurate and reproducible assessment of the retinal microvasculature. The assessment may be in the form of static vascular calibre measurements and assessment of the vascular geometry or dynamic structural and functional assessments. Paediatric retinal microvascular changes are reported in response to elevated blood pressure, type 1 diabetes, increasing adiposity, diet, physical activity, systemic inflammation, metabolic peptides, family history and prenatal factors...
January 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/27017067/summarising-the-retinal-vascular-calibres-in-healthy-diabetic-and-diabetic-retinopathy-eyes
#20
Georgios Leontidis, Bashir Al-Diri, Andrew Hunter
Retinal vessel calibre has been found to be an important biomarker of several retinal diseases, including diabetic retinopathy (DR). Quantifying the retinal vessel calibres is an important step for estimating the central retinal artery and vein equivalents. In this study, an alternative method to the already established branching coefficient (BC) is proposed for summarising the vessel calibres in retinal junctions. This new method combines the mean diameter ratio with an alternative to Murray׳s cube law exponent, derived by the fractal dimension,experimentally, and the branch exponent of cerebral vessels, as has been suggested in previous studies with blood flow modelling...
May 1, 2016: Computers in Biology and Medicine
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