Aditya V Belamkar1, Sayena Jabbehdari2, Alon Harris3, Amir R Hajrasouliha1. 1. Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, USA. 2. Jones Eye Institute, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA. 3. Icahn School of Medicine at Mount Sinai, Ophthalmic Vascular Diagnostic and Research Program at Mount Sinai Hospital, New York, New York, USA.
Abstract
PURPOSE: To review retinal vein occlusion (RVO) and its relationship with retinal oxygen saturation via automated retinal oximetry in eyes with RVO. METHODS: A literature review was performed in PubMed and Medline until October 2021 utilizing specific keywords and cross-matched reference lists. RESULTS: This review found RVO to be associated with risk factors including age, hypertension, cardiovascular and metabolic conditions, male gender, and glaucoma. These may be attributed to a breakdown of regulatory processes in the retina. Retinal venous oxygen saturation (SvO2 ) and arteriovenous difference in eyes with central RVO have been found to be reduced and elevated, respectively. The literature indicates variable and contradictory findings in regard to branch RVO and retinal oxygenation. Additionally, ischaemic eyes have been found to have elevated retinal arterial oxygen saturation; however, the literature reports variable results regarding SvO2 levels. Medications have been suggested to increase SvO2 in RVO eyes, which may represent an important mechanism for disease management. Ranibizumab is currently the most studied drug for retinal oxygenation in RVO and has been suggested to increase SvO2 in RVO eyes. In comparison, dexamethasone was found to decrease SvO2 . CONCLUSION: The current literature on retinal oxygenation in ischaemic subtypes of RVO and in drug therapies is minimal, and further work is required to expand upon our understanding of how ischaemia and drugs influence retinal oxygenation and clinical outcomes.
PURPOSE: To review retinal vein occlusion (RVO) and its relationship with retinal oxygen saturation via automated retinal oximetry in eyes with RVO. METHODS: A literature review was performed in PubMed and Medline until October 2021 utilizing specific keywords and cross-matched reference lists. RESULTS: This review found RVO to be associated with risk factors including age, hypertension, cardiovascular and metabolic conditions, male gender, and glaucoma. These may be attributed to a breakdown of regulatory processes in the retina. Retinal venous oxygen saturation (SvO2 ) and arteriovenous difference in eyes with central RVO have been found to be reduced and elevated, respectively. The literature indicates variable and contradictory findings in regard to branch RVO and retinal oxygenation. Additionally, ischaemic eyes have been found to have elevated retinal arterial oxygen saturation; however, the literature reports variable results regarding SvO2 levels. Medications have been suggested to increase SvO2 in RVO eyes, which may represent an important mechanism for disease management. Ranibizumab is currently the most studied drug for retinal oxygenation in RVO and has been suggested to increase SvO2 in RVO eyes. In comparison, dexamethasone was found to decrease SvO2 . CONCLUSION: The current literature on retinal oxygenation in ischaemic subtypes of RVO and in drug therapies is minimal, and further work is required to expand upon our understanding of how ischaemia and drugs influence retinal oxygenation and clinical outcomes.
Authors: Shaohua Pi; Tristan T Hormel; Xiang Wei; William Cepurna; Bingjie Wang; John C Morrison; Yali Jia Journal: Proc Natl Acad Sci U S A Date: 2020-05-12 Impact factor: 11.205
Authors: Christoph Mitsch; Berthold Pemp; Andreas Pollreisz; Andreas Gleiss; Sonja Karst; Christoph Scholda; Stefan Sacu; Ursula Schmidt-Erfurth Journal: Acta Ophthalmol Date: 2019-10-25 Impact factor: 3.761