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      Diabetic Retinopathy Screening: A Systematic Review on Patients’ Non-Attendance

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          Abstract

          Diabetic Retinopathy is a microvascular complication of diabetes, that can go undetected and unnoticed until irreversible damage and even blindness has occurred. Effective screening for diabetic retinopathy has been proven to reduce the risk of sight loss. The National Health Service (NHS) which provides healthcare for all UK citizens, implemented systematic retinal screening for diabetic retinopathy in England in 2003, with the aim of identifying and treating all patients with sight threatening retinopathy. Crucial to this is patients partaking in the programme. Therefore, increasing screening uptake has been a major focus of the programme. This review explores the views of people living with diabetes who do not attend retinal screening, their characteristics, concerns, experiences of retinal screening and their understanding of the risks of diabetic retinopathy. All studies that satisfied the study inclusion criteria on ‘patients’ non-attendance at retinal screening’, between 2003 to 2017 were included after extensive database search. A total of 16 studies were included in the review. Findings showed that socio-economic deprivation was a major risk factor for non-attendance, about 11.5–13.4% of the screened population had sight threatening retinopathy (STDR), repeated nonattendance was linked to sight threatening diabetic retinopathy, and that certain factors, could be barriers or incentives for screening uptake. Some of those factors are modifiable whilst others are not.

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          Pathophysiology of Diabetic Retinopathy

          Joanna M. Tarr, Kirti Kaul, Mohit Chopra … (2013)
          Diabetes is now regarded as an epidemic, with the population of patients expected to rise to 380 million by 2025. Tragically, this will lead to approximately 4 million people around the world losing their sight from diabetic retinopathy, the leading cause of blindness in patients aged 20 to 74 years. The risk of development and progression of diabetic retinopathy is closely associated with the type and duration of diabetes, blood glucose, blood pressure, and possibly lipids. Although landmark cross-sectional studies have confirmed the strong relationship between chronic hyperglycaemia and the development and progression of diabetic retinopathy, the underlying mechanism of how hyperglycaemia causes retinal microvascular damage remains unclear. Continued research worldwide has focussed on understanding the pathogenic mechanisms with the ultimate goal to prevent DR. The aim of this paper is to introduce the multiple interconnecting biochemical pathways that have been proposed and tested as key contributors in the development of DR, namely, increased polyol pathway, activation of protein kinase C (PKC), increased expression of growth factors such as vascular endothelial growth factor (VEGF) and insulin-like growth factor-1 (IGF-1), haemodynamic changes, accelerated formation of advanced glycation endproducts (AGEs), oxidative stress, activation of the renin-angiotensin-aldosterone system (RAAS), and subclinical inflammation and capillary occlusion. New pharmacological therapies based on some of these underlying pathogenic mechanisms are also discussed.
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            Sex differences in micro- and macro-vascular complications of diabetes mellitus.

            Christine Maric-Bilkan (2017)
            Vascular complications are a leading cause of morbidity and mortality in both men and women with type 1 (T1DM) or type 2 (T2DM) diabetes mellitus, however the prevalence, progression and pathophysiology of both microvascular (nephropathy, neuropathy and retinopathy) and macrovascular [coronary heart disease (CHD), myocardial infarction, peripheral arterial disease (PAD) and stroke] disease are different in the two sexes. In general, men appear to be at a higher risk for diabetic microvascular complications, while the consequences of macrovascular complications may be greater in women. Interestingly, in the absence of diabetes, women have a far lower risk of either micro- or macro-vascular disease compared with men for much of their lifespan. Thus, the presence of diabetes confers greater risk for vascular complications in women compared with men and some of the potential reasons, including contribution of sex hormones and sex-specific risk factors are discussed in this review. There is a growing body of evidence that sex hormones play an important role in the regulation of cardiovascular function. While estrogens are generally considered to be cardioprotective and androgens detrimental to cardiovascular health, recent findings challenge these assumptions and demonstrate diversity and complexity of sex hormone action on target tissues, especially in the setting of diabetes. While some progress has been made toward understanding the underlying mechanisms of sex differences in the pathophysiology of diabetic vascular complications, many questions and controversies remain. Future research leading to understanding of these mechanisms may contribute to personalized- and sex-specific treatment for diabetic micro- and macro-vascular disease.
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              Diabetic retinopathy screening in patients with diabetes mellitus in primary care: Incentives and barriers to screening attendance.

              K.N.D. van Eijk, J.W. Blom, J. Gussekloo … (2012)
              Although diabetic retinopathy (DR) screening is a basic component of diabetes care, uptake of screening programs is less than optimal. Because attendance rates and reasons for non-attendance in an unselected diabetes population are unknown, this study examines incentives and barriers to attend DR-screening. Four focus groups provided patient-related themes concerning individual decision-making regarding attendance at DR-screening. A questionnaire measuring attendance rates and the influence of several factors was sent to 3236 diabetes patients (>18 years) in 20 Dutch general practices, of which 2363 (73%) responded. In the past 3 years, 81% of the patients had attended DR-screening. Patients not attending had lower levels of education, a more recent diagnosis of diabetes, and less frequently used insulin. There was no difference in DM types 1 and 2 patients regarding attendance. Patients attending more often visited health-care providers. Patients reported 'knowledge of detrimental effects of DR on visual acuity', 'sense of duty' and 'fear of impaired vision' as main incentives. The main barrier was the absence of a recommendation by the health-care provider. Knowledge about detrimental effects of DR on visual acuity and recommendation by health-care providers are important, possibly modifiable, factors in the attendance to DR screening. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Int J Environ Res Public Health
                Journal ID (iso-abbrev): Int J Environ Res Public Health
                Journal ID (publisher-id): ijerph
                Title: International Journal of Environmental Research and Public Health
                Publisher: MDPI
                ISSN (Print): 1661-7827
                ISSN (Electronic): 1660-4601
                Publication date (Electronic): 19 January 2018
                Publication date (Print): January 2018
                Volume: 15
                Issue: 1
                Electronic Location Identifier: 157
                Affiliations
                Department of Adult Nursing and Paramedic Sciences, Faculty of Education and Health, University of Greenwich, Avery Hill Campus, Southwood Site, London SE9 2UG, UK; p.d.newton@ 123456gre.ac.uk (P.N.); o.ojo@ 123456gre.ac.uk (O.O.)
                Author notes
                [* ]Correspondence: R.M.Kashim@ 123456greenwich.ac.uk ; Tel.: +44-020-8331-3748
                Author information
                https://orcid.org/0000-0002-8525-6763
                Article
                Publisher ID: ijerph-15-00157
                DOI: 10.3390/ijerph15010157
                PMC ID: 5800256
                PubMed ID: 29351207
                SO-VID: 57adeb44-42ea-4b59-a759-3189c8a41d5c
                Copyright © © 2018 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 22 November 2017
                Date accepted : 15 January 2018
                Categories
                Subject: Review

                ScienceOpen disciplines: Public health
                Keywords: diabetic retinopathy,retinal screening,patients’ non-attendance,systematic review
                Data availability:
                ScienceOpen disciplines: Public health
                Keywords: diabetic retinopathy, retinal screening, patients’ non-attendance, systematic review

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