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

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

Research output: Contribution to journalArticle

22 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)333-341
Number of pages9
JournalGraefe's Archive for Clinical and Experimental Ophthalmology
Volume254
Issue number2
DOIs
Publication statusPublished - 2016 Feb 1

Keywords

  • 8-OHdG
  • Laser speckle flowgraphy
  • Normal tension glaucoma
  • Oxidative stress
  • Skin autofluorescence

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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