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Published in: Graefe's Archive for Clinical and Experimental Ophthalmology 2/2016

01-02-2016 | Glaucoma

The association between systemic oxidative stress and ocular blood flow in patients with normal-tension glaucoma

Authors: Noriko Himori, Hiroshi Kunikata, Yukihiro Shiga, Kazuko Omodaka, Kazuichi Maruyama, Hidetoshi Takahashi, Toru Nakazawa

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 2/2016

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Abstract

Purpose

To evaluate the association between ocular blood flow and biomarkers of systemic oxidative stress, as well as the potential of these biomarkers to assess normal-tension glaucoma (NTG).

Methods

This study included 73 eyes of 73 patients with NTG. We assessed ocular blood flow by measuring mean blur rate (MBR) in the optic nerve head using laser speckle flowgraphy, both overall and separately in the vessel and tissue areas. We also measured urinary 8-hydroxy-2’-deoxyguanosine (8-OHdG) and skin autofluorescence (SAF), and lastly, determined correlations between these measurements and with other clinical parameters.

Results

SAF was correlated with age, circumpapillary retinal nerve fiber layer thickness (cpRNFLT), mean deviation (MD), and overall MBR (P = 0.003, P = 0.013, P = 0.015 and P = 0.006, respectively). SAF and 8-OHdG were both correlated with tissue-area MBR (P = 0.006 and P = 0.010, respectively). Visual acuity, cpRNFLT, mean deviation and tissue-area MBR had a significant tendency to change with NTG severity (P = 0.014, P < 0.001, P < 0.001 and P = 0.006, respectively). Multiple regression analysis revealed that cpRNFLT and 8-OHdG were independent contributing factors to MD (P < 0.001 and P = 0.040, respectively), and that cpRNFLT and 8-OHdG were independent contributing factors to tissue-area MBR (P = 0.005 and P = 0.028, respectively).

Conclusions

We found a close relationship between cpRNFLT, MD, tissue MBR, SAF and 8-OHdG, suggesting that systemic oxidative stress is associated with decreased ocular blood flow and may be involved in the pathogenesis of NTG.
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Metadata
Title
The association between systemic oxidative stress and ocular blood flow in patients with normal-tension glaucoma
Authors
Noriko Himori
Hiroshi Kunikata
Yukihiro Shiga
Kazuko Omodaka
Kazuichi Maruyama
Hidetoshi Takahashi
Toru Nakazawa
Publication date
01-02-2016
Publisher
Springer Berlin Heidelberg
Published in
Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 2/2016
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-015-3203-z

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