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Dinah C, Balaskas K, Greystoke B, Awadzi R, Beke P, Ahern R, Talks J. Sickle Eye Project: a cross-sectional, non-interventional study of the prevalence of visual impairment due to sickle cell retinopathy and maculopathy in the UK. BMJ Open 2024; 14:e082471. [PMID: 38418238 PMCID: PMC10910489 DOI: 10.1136/bmjopen-2023-082471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 02/05/2024] [Indexed: 03/01/2024] Open
Abstract
INTRODUCTION Sickle cell disease (SCD) is one of the most common genetic disorders in the UK, with over 15 000 people affected. Proliferative sickle cell retinopathy (SCR) is a well-described complication of SCD and can result in significant sight loss, although the prevalence in the UK is not currently known. There are currently no national screening guidelines for SCR, with wide variations in the management of the condition across the UK. METHODS AND ANALYSIS The Sickle Eye Project is an epidemiological, cross-sectional, non-interventional study to determine the prevalence of visual impairment due to SCR and/or maculopathy in the UK. Haematologists in at least 16 geographically dispersed hospitals in the UK linked to participating eye clinics will offer study participation to consecutive patients meeting the inclusion criteria attending the sickle cell clinic. The following study procedures will be performed: (a) best corrected visual acuity with habitual correction and pinhole, (b) dilated slit lamp biomicroscopy and funduscopy, (c) optical coherence tomography (OCT), (d) OCT angiography where available, (e) ultrawide fundus photography, (f) National Eye Institute Visual Function Questionnaire-25 and (g) acceptability of retinal screening questionnaire. The primary outcome is the proportion of people with SCD with visual impairment defined as logarithm of the minimum angle of resolution ≥0.3 in at least one eye. Secondary outcomes include the prevalence of each stage of SCR and presence of maculopathy by age and genotype; correlation of stage of SCR and maculopathy to severity of SCD; the impact of SCR and presence of maculopathy on vision-related quality of life; and the acceptability to patients of routine retinal imaging for SCR and maculopathy. ETHICS AND DISSEMINATION Ethical approval was obtained from the South Central-Oxford A Research Ethics Committee (REC 23/SC/0363). Findings will be reported through academic journals in ophthalmology and haematology.
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Affiliation(s)
- Christiana Dinah
- Ophthalmology, London North West Healthcare NHS Trust, Harrow, UK
| | - Konstantinos Balaskas
- Moorfields Eye Hospital NHS Foundation Trust, London, UK
- Institute of Ophthalmology, UCL, London, UK
| | | | - Rossby Awadzi
- London North West University Healthcare NHS Trust, Harrow, UK
| | | | | | - James Talks
- Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
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Brandsen RP, Diederen RMH, Bakhlakh S, Nur E, Schlingemann RO, Biemond BJ. Natural history and rate of progression of retinopathy in adult patients with sickle cell disease: an 11-year follow-up study. Blood Adv 2023; 7:3080-3086. [PMID: 36897257 PMCID: PMC10331402 DOI: 10.1182/bloodadvances.2022009147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 02/15/2023] [Accepted: 02/16/2023] [Indexed: 03/11/2023] Open
Abstract
Sickle cell retinopathy (SCR) is a complication of sickle cell disease (SCD). Proliferative SCR (PSCR) can lead to severe visual impairment due to vitreous hemorrhage or retinal detachment. Knowledge of risk factors for progression and complications of SCR is limited. The aim of this study is to describe the natural history of SCR and to identify risk factors for progressive SCR and development of PSCR. We retrospectively analyzed disease progression in 129 patients with SCD with a median follow-up period of 11 years (interquartile range, 8.5-12). Patients were divided in 2 groups. The genotypes hemoglobin SS (HbSS), HbSβ0-thalassemia, and HbSβ+-thalassemia were grouped together (n = 83; 64.3%), whereas patients with HbSC (n = 46; 35.7%) were grouped separately. Progression of SCR was observed in 28.7% (37 of 129) of patients. Older age (adjusted odds ratio [aOR], 1.073; 95% confidence interval [CI], 1.024-1.125; P = .003), HbSC genotype (aOR, 25.472; 95% CI, 3.788-171.285; P ≤ 0.001), and lower HbF (aOR, 0.786; 95% CI, 0.623-0.993; P = .043) were associated with PSCR at end of follow-up. Lack of any SCR at end of follow-up was associated with female sex (aOR, 2.555; 95% CI, 1.101-5.931; P = .029), HbSS/HbSβ0/HbSβ+ genotype (aOR, 3.733; 95% CI, 1.131-12.321; P = .031), and higher HbF levels (aOR, 1.119; 95% CI, 1.007-1.243; P = .037). Differentiated strategies for screening and follow-up of SCR could be considered for patients at low or high risk.
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Affiliation(s)
- Rajani P. Brandsen
- Department of Ophthalmology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
- Department of Hematology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Roselie M. H. Diederen
- Department of Ophthalmology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Siham Bakhlakh
- Department of Hematology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Erfan Nur
- Department of Hematology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
- Department of Blood Cell Research, Sanquin Research and Landsteiner Laboratory, Amsterdam, The Netherlands
| | - Reinier O. Schlingemann
- Department of Ophthalmology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
- Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland
| | - Bart J. Biemond
- Department of Hematology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
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Zulueta P, Minniti CP, Rai A, Toribio TJ, Moon JY, Mian UK. Routine Ophthalmological Examination Rates in Adults with Sickle Cell Disease Are Low and Must Be Improved. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:3451. [PMID: 36834146 PMCID: PMC9962573 DOI: 10.3390/ijerph20043451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/12/2023] [Accepted: 02/14/2023] [Indexed: 06/18/2023]
Abstract
The American Academy of Ophthalmology and the National Heart, Lung and Blood Institute recommend patients with sickle cell disease (SCD) undergo dilated funduscopic exams (DFE) every 1-2 years to screen for sickle retinopathy. There is a paucity of data on the adherence rate to these guidelines; a retrospective study was performed to evaluate our institution's adherence. A chart review of 842 adults with SCD, seen 3/2017-3/2021 in the Montefiore healthcare system (All Patients), was done. Only about half of All Patients (n = 842) had >1 DFE during the study period (Total Examined Patients, n = 415). The Total Examined Patients were categorized as screening, those without retinopathy (Retinopathy-, n = 199), or follow-up, including individuals previously diagnosed with retinopathy (Retinopathy+, n = 216). Only 40.3% of screening patients (n = 87) had DFE at least biennially. As expected, there was a significant decrease in the average DFE rate of the Total Examined Patients after the COVID-19 pandemic started (13.6%) compared to pre-COVID (29.8%, p < 0.001). Similarly, there was a significant decrease in the screening rate of Retinopathy- patients from 18.6% on average pre-COVID to 6.7% during COVID (p < 0.001). This data shows the sickle retinopathy screening rate is low and innovative approaches may need to be employed to remedy this issue.
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Affiliation(s)
| | | | - Anvit Rai
- Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Tiana J. Toribio
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, New York, NY 10461, USA
- Department of Pediatrics, Montefiore Medical Center, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Jee-Young Moon
- Department of Epidemiology & Population Health, Montefiore Medical Center, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Umar K. Mian
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, New York, NY 10461, USA
- Department of Pediatrics, Montefiore Medical Center, Albert Einstein College of Medicine, New York, NY 10461, USA
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Hassan T, Badr M, Hanna D, Arafa M, Elhewala A, Dabour S, Shehata S, Rahman DA. Retinopathy in Egyptian patients with sickle cell disease: A cross-sectional study. Medicine (Baltimore) 2021; 100:e28355. [PMID: 34941149 PMCID: PMC8702288 DOI: 10.1097/md.0000000000028355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 12/01/2021] [Indexed: 01/05/2023] Open
Abstract
Sickle cell disease (SCD) is a disorder that causes red blood cells to become sticky and rigid. Sickle cells can block blood flow in small blood vessels depriving the eye of oxygen and cause damage. This is called sickle retinopathy that can progress to severe proliferative sickle cell retinopathy, bleeding into the eye, detachment of the retina or even loss of vision.To assess ocular manifestations and detect frequency of retinopathy in patients with SCD.Cross-sectional study was conducted on 32 patients with SCD. They were 22 males and 10 females with mean age of 12 years. Routine investigations as well as ophthalmological examination including visual acuity, fluorescein angiography and optical coherence tomography were done.We found that 8 patients (25%) suffered from proliferative retinopathy, 10 patients (31%) showed tortuous retinal veins, while 14 patients (44%) were normal. All patients showed macular thinning on optical coherence tomography examination.We concluded that frequency of retinopathy in patients with SCD is more than expected and it was higher in patients who started transfusion at a later age. More attention should be paid for this problem and close observations and follow up is strongly needed.
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Affiliation(s)
- Tamer Hassan
- Pediatrics Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Mohamed Badr
- Pediatrics Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Diana Hanna
- Pediatrics Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Mohamed Arafa
- Pediatrics Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Ahmed Elhewala
- Pediatrics Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Sherief Dabour
- Ophthalmology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Saad Shehata
- Damanhour Teaching Hospital, Damanhour, El Beheira Governorate, Egypt
| | - Doaa Abdel Rahman
- Pediatrics Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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Jang T, Mo G, Stewart C, Khoury L, Ferguson N, Egini O, Muthu J, Dutta D, Salifu M, Lim SH. Hematopoietic Stem Cell Transplant for Sickle Cell Disease: PATIENT SELEction and Timing Based on Sickle Cell-Related Multiple Chronic Conditions. Cell Transplant 2021; 30:9636897211046559. [PMID: 34628962 PMCID: PMC8504222 DOI: 10.1177/09636897211046559] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Hematopoietic stem cell transplant (HSCT) is the only cure for patients with sickle cell disease (SCD). Although most SCD patients experience progressive end-organ damage and shortened lifespans, not all patients follow the same disease course, tempo, or outcome. Therefore, the dilemma facing physicians is weighing the selection of patients and timing for the procedure against donor type and transplant-related mortality and morbidity that go up with increasing age. On the other hand, the dilemma facing the patients and families is how acceptable HSCT that carries some mortality risks to them. We have analyzed the chronic conditions due to SCD in 449 patients to determine whether SCD-related multiple chronic conditions (MCC) can be risk-stratified to identify the group of patients predicted to not only have shortened lifespans but also functional limitation and poor quality of life so that these at-risk patients can be offered HSCT early and before MCC develops. We identified that the age of onset of the first SCD-related chronic conditions strongly predicted for the risks for disease-related MCC. SCD patients who suffered their first disease-related chronic condition before age 30 years developed MCC at a rate of 19.1 times faster than those at a later age. These patients are therefore high-risk patients and should be offered HSCT early in the course of their disease before multiple organ damage intervenes, even if matched-related donors are not available. This patient selection and timing approach provides a forum for an easy-to-understand and real-time discussion, including the choice of donor type, with SCD patients and families when considering HSCT.
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Affiliation(s)
- Tim Jang
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
- GM and TJ are equal first authors
| | - George Mo
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
- GM and TJ are equal first authors
| | - Connor Stewart
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
- GM and TJ are equal first authors
| | - Leen Khoury
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
| | - Natalie Ferguson
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
| | - Ogechukwu Egini
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
| | - John Muthu
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
| | - Dibyendu Dutta
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
| | - Moro Salifu
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
| | - Seah H Lim
- Division of Hematology and Oncology, SUNY Downstate Health Sciences University, Brooklyn, New York, NY, USA
- Seah H Lim MD PhD FRCP (Lond.) FRCPath. FACP, SUNY Downstate Health Sciences University, 450 Clarkson Avenue MSC #20, Brooklyn, New York 11203, USA.
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Abdalla Elsayed MEA, Mura M, Al Dhibi H, Schellini S, Malik R, Kozak I, Schatz P. Sickle cell retinopathy. A focused review. Graefes Arch Clin Exp Ophthalmol 2019; 257:1353-1364. [PMID: 30895451 DOI: 10.1007/s00417-019-04294-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 02/23/2019] [Accepted: 03/10/2019] [Indexed: 10/27/2022] Open
Abstract
PURPOSE To provide a focused review of sickle cell retinopathy in the light of recent advances in the pathogenesis, multimodal retinal imaging, management of the condition, and migration trends, which may lead to increased prevalence of the condition in the Western world. METHODS Non-systematic focused literature review. RESULTS Sickle retinopathy results from aggregation of abnormal hemoglobin in the red blood cells in the retinal microcirculation, leading to reduced deformability of the red blood cells, stagnant blood flow in the retinal precapillary arterioles, thrombosis, and ischemia. This may be precipitated by hypoxia, acidosis, and hyperosmolarity. Sickle retinopathy may result in sight threatening complications, such as paracentral middle maculopathy or sequelae of proliferative retinopathy, such as vitreous hemorrhage and retinal detachment. New imaging modalities, such as wide-field imaging and optical coherence tomography angiography, have revealed the microstructural features of sickle retinopathy, enabling earlier diagnosis. The vascular growth factor ANGPTL-4 has recently been identified as a potential mediator of progression to proliferative retinopathy and may represent a possible therapeutic target. Laser therapy should be considered for proliferative retinopathy in order to prevent visual loss; however, the evidence is not very strong. With recent development of wide-field imaging, targeted laser to ischemic retina may prove to be beneficial. Exact control of intraoperative intraocular pressure, including valved trocar vitrectomy systems, may improve the outcomes of vitreoretinal surgery for complications, such as vitreous hemorrhage and retinal detachment. Stem cell transplantation and gene therapy are potentially curative treatments, which may prevent retinopathy. CONCLUSIONS There is lack of evidence regarding the optimal management of sickle retinopathy. Further study is needed to determine if recent progress in the understanding of the pathophysiology and diagnosis of sickle retinopathy may translate into improved management and outcome.
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Affiliation(s)
| | - Marco Mura
- Vitreoretinal Division, King Khaled Eye Specialist Hospital, Al-Oruba Street, 7191, Riyadh, 11462, Kingdom of Saudi Arabia
| | - Hassan Al Dhibi
- Vitreoretinal Division, King Khaled Eye Specialist Hospital, Al-Oruba Street, 7191, Riyadh, 11462, Kingdom of Saudi Arabia
| | - Silvana Schellini
- Oculoplasty Division, King Khaled Eye Specialist Hospital, Riyadh, Kingdom of Saudi Arabia
| | - Rizwan Malik
- Glaucoma Division, King Khaled Eye Specialist Hospital, Riyadh, Kingdom of Saudi Arabia
| | - Igor Kozak
- Moorfields Eye Hospital Centre, Abu Dhabi, United Arab Emirates
| | - Patrik Schatz
- Vitreoretinal Division, King Khaled Eye Specialist Hospital, Al-Oruba Street, 7191, Riyadh, 11462, Kingdom of Saudi Arabia. .,Department of Ophthalmology, Clinical Sciences, Skane University Hospital, Lund University, Lund, Sweden.
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Mowatt L, Ajanaku A, Knight-Madden J. Knowledge, beliefs and practices regarding sickle cell eye disease of patients at the sickle cell unit, Jamaica. Pan Afr Med J 2019; 32:84. [PMID: 31223375 PMCID: PMC6560980 DOI: 10.11604/pamj.2019.32.84.14742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Accepted: 01/29/2019] [Indexed: 11/30/2022] Open
Abstract
Introduction Sickle cell disease can result in visually threatening eye disease (proliferative sickle cell retinopathy). This can be prevented with timely eye screening. It is important for patients to understand their role. Our research is to determine the knowledge, beliefs and practices (KBP) regarding eye disease of Sickle Cell patients and the impact of genotype, demographic and socio-economic status. Methods Cross-sectional study at the Sickle Cell Unit, Jamaica during May 2016. Consecutive non-pregnant adults (>18 years of age) attendees, who were not acutely unwell, were invited to participate. A 26-item single interviewer administered questionnaire was used to obtain socio-demographic data, highest level of education completed, employment status, sickle cell genotype, if known, frequency of clinic attendance and patients' knowledge, beliefs and practices. Ten of these were yes/no questions, whereas eight required that they choose correct answers from four choices. Results One hundred subjects were recruited, 72% had homozygous SS disease. Their ages ranged from 18-63 years (mean 34.1 years, SD11.3). Fifty six percent were female. Most (75%) had achieved at least secondary education. The majority (62%) were unemployed. The mean belief score was 3.6/6(60%) and the mean knowledge and practice scores were 3.3/7(47%) and 2.2/5(44%) respectively. Milder genotypes had higher knowledge scores vs the more severe genotypes (4.0 vs 3.2, P=0.013). Only 28% had regular eye examinations; less than 50% had seen an ophthalmologist in the past year. Practice scores were higher in employed than in unemployed patients (2.6 vs 1.9, (P=0.04)). Employed patients were more likely than the unemployed to see their eye doctor for regular eye “examinations” (42.1% vs 19.4%, χ2=6.0, P=0.02). The practice and knowledge scores correlated (r2=0.363, P<0.001) and belief score (r2=0.304, P =0.002), except where 98% believed they should see an ophthalmologist annually, but only 42% did, and 21% had never. Conclusion Knowledge scores were fair, however, the practice was not always in keeping with knowledge.
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Affiliation(s)
- Lizette Mowatt
- Ophthalmology Division, Department of Surgery, Radiology, Anaesthesia and Intensive Care, Faculty of Medical Sciences, University of the West Indies, Mona, Jamaica.,Ophthalmology Division, University Hospital of the West Indies, Jamaica
| | - Ayodeji Ajanaku
- Russell Hall Hospital, The Dudley Group NHS Foundation Trust
| | - Jennifer Knight-Madden
- Sickle Cell Unit, Caribbean Institute for Health Research, University of the West Indies, Mona Campus Kingston 7, Jamaica
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Mathew R, Sivaprasad S. Advances in the diagnosis of sickle cell retinopathy. EXPERT REVIEW OF OPHTHALMOLOGY 2018. [DOI: 10.1080/17469899.2018.1523007] [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: 10/28/2022]
Affiliation(s)
| | - Sobha Sivaprasad
- NIHR Moorfields Biomedical Research Center, London, United Kingdom
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Lim WS, Magan T, Mahroo OA, Hysi PG, Helou J, Mohamed MD. Retinal thickness measurements in sickle cell patients with HbSS and HbSC genotype. Can J Ophthalmol 2017; 53:420-424. [PMID: 30119799 PMCID: PMC6117475 DOI: 10.1016/j.jcjo.2017.10.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 10/23/2017] [Accepted: 10/24/2017] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Temporal macula thinning has been reported in sickle cell patients, but it remains unclear if there is a difference between HbSS and HbSC genotypes. We aimed to quantitatively compare macular thickness between eyes with HbSS and HbSC genotype. DESIGN Retrospective descriptive study. METHODS Consecutive patients seen over a 5.5-year period in the Ophthalmology Department at St Thomas' Hospital, London, were identified. Macular optical coherence tomography images were retrospectively analyzed. The retinal thickness in all 9 subfields of the Early Treatment Diabetic Retinopathy Study (ETDRS) grid was compared between HbSS and HbSC eyes. Right eyes and left eyes were analyzed independently, as well as averaged measurements from both eyes. Comparison was made between the 2 genotypes, adjusting for age and sex, and for multiple testing. Scans were excluded in cases of poor fixation or ocular comorbidity affecting retinal thickness. RESULTS 132 HbSC and 120 HbSS patients were identified. Scans from 166 right and 153 left eyes were included (with approximately equal numbers of HbSS and HbSC genotypes). Mean retinal thickness was lower in HbSS eyes compared with HbSC eyes in all subfields of the ETDRS grid, but in most subfields the difference was <10 microns. Differences reached statistical significance for outer superior, inferior, and temporal subfields and the inner temporal subfield (p < 0.05). CONCLUSION Although the HbSC genotype is more strongly associated with proliferative retinopathy, HbSS patients had on average more macular thinning.
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Affiliation(s)
- Wei S Lim
- Ophthalmology Department, St Thomas' Hospital, London, United Kingdom.
| | - Tejal Magan
- Ophthalmology Department, St Thomas' Hospital, London, United Kingdom
| | - Omar A Mahroo
- Ophthalmology Department, St Thomas' Hospital, London, United Kingdom; NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and the UCL Institute of Ophthalmology, London; Section of Academic Ophthalmology, School of Life Course Sciences(,) Faculty of Life Course Sciences and Medicine, King's College London, St Thomas' Hospital Campus, London, United Kingdom
| | - Pirro G Hysi
- Section of Academic Ophthalmology, School of Life Course Sciences(,) Faculty of Life Course Sciences and Medicine, King's College London, St Thomas' Hospital Campus, London, United Kingdom
| | - Juliana Helou
- Ophthalmology Department, St Thomas' Hospital, London, United Kingdom
| | - Moin D Mohamed
- Ophthalmology Department, St Thomas' Hospital, London, United Kingdom
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Abstract
PURPOSE OF REVIEW To review recent literature pertaining to sickle cell retinopathy (SCR) and, in particular, sickle cell maculopathy. RECENT FINDINGS Several recent studies suggest that macular perfusion abnormalities seen in patients with sickle cell disease of various genotypes may affect both the superficial and deep capillary plexi, with a predilection for the deep capillary plexus. Further, these changes may be associated with areas of macular thinning, as well as with peripheral retinal ischemia, even in individuals without visual symptoms, contrary to what has previously been described in both diabetic retinopathy and retinal vein occlusion. Several cases also suggest that paracentral acute middle maculopathy may be the pathophysiologic mechanism by which microvascular occlusion leads to macular thinning. SUMMARY Sickle cell disease can manifest in a number of ways within the orbit as well as intraocularly because of its nonspecific vasoocclusive episodes. However, SCR is the most common ophthalmic manifestation of this disease. Historically, SCR has been considered a peripheral retinopathy, but the development and use of spectral-domain optical coherence tomography and optical coherence tomography angiography suggest that significant macular vascular changes occur early in this disease, even in asymptomatic individuals.
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van Tuijn CFJ, Schimmel M, van Beers EJ, Nur E, Biemond BJ. Prospective evaluation of chronic organ damage in adult sickle cell patients: A seven-year follow-up study. Am J Hematol 2017; 92:E584-E590. [PMID: 28699283 DOI: 10.1002/ajh.24855] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 06/30/2017] [Accepted: 07/05/2017] [Indexed: 02/02/2023]
Abstract
Organ damage in sickle cell disease (SCD) is a crucial determinant for disease severity and prognosis. In a previous study, we analyzed the prevalence of SCD-related organ damage and complications in adult sickle cell patients. We now describe a seven-year follow-up of this cohort.All patients from the primary analysis in 2006 (n = 104), were included for follow-up. Patients were screened for SCD-related organ damage and complications (microalbuminuria, renal failure, elevated tricuspid regurgitation flow velocity (TRV) (≥2.5 m/seconds), retinopathy, iron overload, cholelithiasis, avascular osteonecrosis, leg ulcers, acute chest syndrome (ACS), stroke, priapism and admissions for vaso-occlusive crises (VOC) biannually. Upon 7 years of follow-up, progression in the prevalence of avascular osteonecrosis (from 12.5% to 20.4%), renal failure (from 6.7% to 23.4%), retinopathy (from 39.7% to 53.8%) was observed in the whole group. In HbSS/HbSβ0 -thal patients also progression in microalbuminuria (from 34% to 45%) and elevated TRV (from 40% to 48%) was observed while hardly any progression in the prevalence of cholelithiasis, priapism, stroke or chronic ulcers was seen. The proportion of patients with at least one episode of ACS increased in the group of HbSS/HbSβ0 -thal patients from 32% to 49.1%. In conclusion, 62% of the sickle cell patients in this prospective cohort study developed a new SCD-related complication in a comprehensive care setting within 7 years of follow-up. Although the hospital admission rate for VOC remained stable, multiple forms of organ damage increased substantially. These observations underline the need for continued screening for organ damage in all adult patients with SCD.
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Affiliation(s)
| | - Marein Schimmel
- Department of Hematology; Academic Medical Center; Amsterdam the Netherlands
| | - Eduard J. van Beers
- Van Creveldkliniek, University Medical Center Utrecht; Utrecht The Netherlands
| | - Erfan Nur
- Department of Hematology; Academic Medical Center; Amsterdam the Netherlands
| | - Bart J. Biemond
- Department of Hematology; Academic Medical Center; Amsterdam the Netherlands
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Menaa F, Khan BA, Uzair B, Menaa A. Sickle cell retinopathy: improving care with a multidisciplinary approach. J Multidiscip Healthc 2017; 10:335-346. [PMID: 28919773 PMCID: PMC5587171 DOI: 10.2147/jmdh.s90630] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Sickle cell retinopathy (SCR) is the most representative ophthalmologic complication of sickle cell disease (SCD), a hemoglobinopathy affecting both adults and children. SCR presents a wide spectrum of manifestations and may even lead to irreversible vision loss if not properly diagnosed and treated at the earliest. Over the past decade, multidisciplinary research developments have focused upon systemic, genetic, and ocular risk factors of SCR, enabling the clinician to better diagnose and manage these patients. In addition, newer imaging and testing modalities, such as spectral domain-optical coherence tomography angiography, have resulted in the detection of subclinical retinopathy related to SCD. Innovative therapy includes intravitreal injection of an anti-vascular endothelial growth factor (eg, Lucentis® [ranibizumab] or Eylea® [aflibercept]) which appears comparatively safe and efficient, and may be combined with laser photocoagulation (LPC) for proliferative SCR. The effect of LPC alone does not significantly lead to the regression of advanced SCR, although it helps in avoiding hemorrhage and sight loss. This comprehensive article is based on 10-years retrospective (2007–2017) studies. It aims to present advances and recommendations in SCR theranostics while pointing out the requirement of combinatorial approaches for better management of SCR patients. To reach this goal, we identified and analyzed randomized original and review articles, clinical trials, non-randomized intervention studies, and observational studies using specified keywords in various databases (eg, Medline, Embase, Cochrane, ClinicalTrials.gov).
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Affiliation(s)
- Farid Menaa
- Department of Pharmaceutical Sciences and Nanomedicine, California Innovations Corporation, San Diego, CA, USA.,Departments of Clinical Medicine and Laser Therapy, Centre Médical des Guittières, Saint-Philbert-de-Grand-Lieu, Loire-Atlantique, France
| | - Barkat Ali Khan
- Faculty of Pharmacy and Alternative Medicine, The Islamia University of Bahawalpur, Bahawalpur
| | - Bushra Uzair
- Department of Bioinformatics and Biotechnology, International Islamic University, Islamabad, Pakistan
| | - Abder Menaa
- Departments of Clinical Medicine and Laser Therapy, Centre Médical des Guittières, Saint-Philbert-de-Grand-Lieu, Loire-Atlantique, France
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