BACKGROUND: 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.
BACKGROUND: 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.
Authors: James Kang Hao Goh; Carol Y Cheung; Shaun Sebastian Sim; Pok Chien Tan; Gavin Siew Wei Tan; Tien Yin Wong Journal: J Diabetes Sci Technol Date: 2016-02-01
Authors: Klemens Fondi; Piotr A Wozniak; Kinga Howorka; Ahmed M Bata; Gerold C Aschinger; Alina Popa-Cherecheanu; Katarzyna J Witkowska; Anton Hommer; Doreen Schmidl; René M Werkmeister; Gerhard Garhöfer; Leopold Schmetterer Journal: Diabetologia Date: 2017-05-25 Impact factor: 10.122
Authors: Norman P Blair; Justin Wanek; Anthony E Felder; Charlotte E Joslin; Jacob K Kresovich; Jennifer I Lim; Felix Y Chau; Yannek Leiderman; Mahnaz Shahidi Journal: Invest Ophthalmol Vis Sci Date: 2017-10-01 Impact factor: 4.799