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• W2891761989 abstract "The purpose of this experimental clinical study was to assess the effects of dark adaptation and acute changes in glycemia on retinal vessel diameters in men. The study included 14 patients (mean age 63 years, range 48–74 years) with type 2 diabetes mellitus and minimal or no diabetic retinopathy. Retinal vessel diameters were assessed using infrared photography before and after dark adaptation, first while fasting and then at peak hyperglycemia during an oral glucose tolerance test (OGTT). Dark adaptation was accompanied by retinal vasodilatation, both during fasting (mean glycemia 7.6 ± 1.7 mM) and postprandial hyperglycemia (15.7 ± 4.2 mM). When fasting, the increase in vein diameter during dark adaptation was 2.0% after 20 min (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:mi>P</mml:mi><mml:mo>=</mml:mo><mml:mn>0.018</mml:mn></mml:mrow></mml:math>) and 2.9% after 40 min (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:mi>P</mml:mi><mml:mo>=</mml:mo><mml:mn>0.010</mml:mn></mml:mrow></mml:math>). When subjects were hyperglycemic, the increase during dark adaptation was 2.8% for retinal vein diameters (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:mi>P</mml:mi><mml:mo>=</mml:mo><mml:mn>0.027</mml:mn></mml:mrow></mml:math>) and 2.0% for retinal artery diameters after 20 min (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:mi>P</mml:mi><mml:mo>=</mml:mo><mml:mn>0.002</mml:mn></mml:mrow></mml:math>) and 1.7% for retinal artery diameters after 40 min (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:mi>P</mml:mi><mml:mo>=</mml:mo><mml:mn>0.022</mml:mn></mml:mrow></mml:math>). For identical conditions of light/dark adaptation, retinal vessels were dilated when subjects were fasting compared to postprandial hyperglycemia. Thus, darkness and fasting were both associated with retinal vasodilation in this short-term experiment in patients with type 2 diabetes. Future studies should determine whether both the stimuli of vasodilation lead to retinal hyperperfusion, which would support that they may be involved in the aggravation of diabetic retinopathy." @default.
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• W2891761989 date "2018-09-18" @default.
• W2891761989 modified "2023-10-18" @default.
• W2891761989 title "Retinal Vessel Diameter Changes in Relation to Dark Adaptation and Acute Hyperglycemia" @default.
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• W2891761989 doi "https://doi.org/10.1155/2018/7064359" @default.
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