Thorunn Scheving Eliasdottir1,2,3, David Bragason4, Sveinn Hakon Hardarson5,4, Gudrun Kristjansdottir5, Einar Stefánsson5,4. 1. University of Iceland, Reykjavik, Iceland. tse@hi.is. 2. Department of Opthalmolgy, Landspítali - The National University Hospital of Iceland, Eiriksgata 37, Reykjavik, Iceland. tse@hi.is. 3. Department of Anesthesiology, Landspítali - The National University Hospital of Iceland, Reykjavik, Iceland. tse@hi.is. 4. Department of Opthalmolgy, Landspítali - The National University Hospital of Iceland, Eiriksgata 37, Reykjavik, Iceland. 5. University of Iceland, Reykjavik, Iceland.
Abstract
PURPOSE: To estimate the presence and variability of retinal hypoxia in patients with central retinal vein occlusion (CRVO). METHOD: Hemoglobin oxygen saturation was measured in retinal vessels of both eyes in 14 patients with unilateral CRVO. The noninvasive spectrophotometric retinal oximeter is based on a fundus camera and simultaneously captures two images at 570 nm and 600 nm wavelengths. Five of the patients were followed with repeated retinal oximetry images over time. RESULTS: The mean oxygen saturation in retinal venules was 31 % ±12 % in CRVO eyes and 52 % ±11 % in unaffected fellow eyes (mean ±SD, n = 14, p < 0.0001). The arteriovenous difference was 63 % ±11 % in eyes with CRVO and 43 % ±7 % in fellow eyes (p < 0.0001). The variability of retinal venous oxygen saturation was substantial within and between eyes affected by CRVO. Venular oxygen saturation improved with treatment and over time in all five patients that were followed. CONCLUSION: CRVO eyes are hypoxic compared to fellow eyes and arteriovenous difference in hemoglobin oxygen saturation is increased. This is consistent with tissue hypoxia resulting from reduced blood flow. Further studies are needed to understand the correlation between hypoxia, severity of disease and prognosis.
PURPOSE: To estimate the presence and variability of retinal hypoxia in patients with central retinal vein occlusion (CRVO). METHOD: Hemoglobin oxygen saturation was measured in retinal vessels of both eyes in 14 patients with unilateral CRVO. The noninvasive spectrophotometric retinal oximeter is based on a fundus camera and simultaneously captures two images at 570 nm and 600 nm wavelengths. Five of the patients were followed with repeated retinal oximetry images over time. RESULTS: The mean oxygen saturation in retinal venules was 31 % ±12 % in CRVO eyes and 52 % ±11 % in unaffected fellow eyes (mean ±SD, n = 14, p < 0.0001). The arteriovenous difference was 63 % ±11 % in eyes with CRVO and 43 % ±7 % in fellow eyes (p < 0.0001). The variability of retinal venous oxygen saturation was substantial within and between eyes affected by CRVO. Venular oxygen saturation improved with treatment and over time in all five patients that were followed. CONCLUSION: CRVO eyes are hypoxic compared to fellow eyes and arteriovenous difference in hemoglobin oxygen saturation is increased. This is consistent with tissue hypoxia resulting from reduced blood flow. Further studies are needed to understand the correlation between hypoxia, severity of disease and prognosis.
Authors: Min H Kang; Chandrakumar Balaratnasingam; Paula K Yu; William H Morgan; Ian L McAllister; Stephen J Cringle; Dao-Yi Yu Journal: Invest Ophthalmol Vis Sci Date: 2011-03-14 Impact factor: 4.799
Authors: Peter A Campochiaro; Gulnar Hafiz; Syed Mahmood Shah; Quan Dong Nguyen; Howard Ying; Diana V Do; Edward Quinlan; Ingrid Zimmer-Galler; Julia A Haller; Sharon D Solomon; Jennifer U Sung; Yasmin Hadi; Kashif A Janjua; Nida Jawed; David F Choy; Joseph R Arron Journal: Mol Ther Date: 2008-02-05 Impact factor: 11.454