The effect of systemic hyperoxia on optic nerve head blood flow in primary open-angle glaucoma patients

Naoki Kiyota, Yukihiro Shiga, Shiori Suzuki, Marika Sato, Naoko Takada, Shigeto Maekawa, Kazuko Omodaka, Kazuichi Maruyama, Hiroshi Kunikata, Toru Nakazawa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

PURPOSE. To assess the optic nerve head blood flow (ONH BF) response to hyperoxia in glaucoma patients using laser speckle flowgraphy (LSFG), and determine factors influencing vasoreactivity within the ONH. METHODS. We performed oxygen provocation testing in 15 eyes of 15 primary open-angle glaucoma (POAG) patients and 15 eyes of 15 age-matched control subjects. During the test, LSFG-derived tissue mean blur rate (MBRT) and clinical variables, including blood pressure, were recorded. We evaluated differences in MBRT alteration during systemic hyperoxia between the groups. Additionally, we calculated the mean % change in MBRT against baseline and determined contributing factors. RESULTS. Despite similar clinical variables during systemic hyperoxia in both groups, the mean % change in MBRT against baseline was significantly lower in the POAG than control subjects (P < 0.0001). Multiple regression analysis revealed that baseline MBRT and systolic blood pressure (SBP) were contributing factors to mean % change in MBRT (β = 0.44, β = –0.32, respectively). Additionally, baseline MBRT and SBP were strongly correlated to mean % change in MBRT only in the POAG group (r = 0.83, P < 0.0001; r = –0.60, P = 0.02, respectively). CONCLUSIONS. POAG patients had a weaker vasoreactive response to hyperoxia than controls, and this impaired response was associated with lower basal ONH BF and higher SBP. These findings suggest that pre-existing vasoconstriction in the ONH of eyes with glaucoma might reduce the capacity of the vasoconstrictive response to hyperoxia. Alternatively, the pathways that mediate hyperoxia-induced vasoconstriction could be altered in POAG.

Original languageEnglish
Pages (from-to)3181-3188
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume58
Issue number7
DOIs
Publication statusPublished - 2017 Jun

Keywords

  • Autoregulation
  • Hyperoxia
  • Laser speckle flowgraphy
  • Ocular blood flow

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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