Associations of retinal oximetry in persons with diabetes

Ryan EK Man, Muhammad B Sasongko, Jing Xie, Ryo Kawasaki, William J Best, Jonathan E Noonan, Chi D Luu, Jie Jin Wang, Ecosse L Lamoureux

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11 Citations (Scopus)

Abstract

There are limited data available on the variables that might affect retinal vessel oxygen saturation (SO2) in diabetes. Therefore, the aim of this study is to assess factors associated with retinal oximetry values in persons with diabetes. Design: Clinic-based cross-sectional study. Participants: Fifty-eight persons with diabetes aged 18+ years, recruited from the University of Melbourne, the Royal Victorian Eye and Ear Hospital, and St. Vincent's Hospital (Melbourne), Australia. Methods: Retinal oximetry was performed using the oximetry module of the Vesselmap system (Imedos UG, Jena, Germany) in 92 diabetic eyes. Generalized estimating equation models were used to estimate the associations between candidate variables (age; gender; retinal capillary flow; duration of diabetes; hypertension; smoking status; presence of diabetic retinopathy [DR]; glycated haemoglobin; triglyceride; total cholesterol; finger SO2 and ocular perfusion pressure) with retinal oximetry measures. Main Outcome Measure: Arteriolar SO2, venular SO2 and the arterio-venous (A-V) difference. Results: Of the candidate factors assessed, only the presence of DR was significantly associated with increased venular SO2 and decreased A-V difference in unadjusted analyses. In models adjusting for age and gender and significant variables from unadjusted analyses, compared with no DR, the presence of DR was significantly associated with greater retinal venular SO2 values (β=3.65%, 95% confidence interval: 0.67-6.63%) and decreased A-V difference (β=-2.00%, 95% confidence interval: -3.46 to -0.53%). Conclusion: In patients with diabetes, eyes with DR were associated with increased venular SO2 and decreased A-V difference compared with eyes without DR, suggesting an altered metabolic state in DR.

Original languageEnglish
Pages (from-to)124-131
Number of pages8
JournalClinical and Experimental Ophthalmology
Volume43
Issue number2
DOIs
Publication statusPublished - Mar 2015
Externally publishedYes

Keywords

  • Diabetes
  • Diabetic retinopathy
  • Oxygen saturation
  • Retinal oximetry
  • Retinal vasculature

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