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This project has the following specific purposes:
- To develop a clinically usable test to determine the blood glucose level or HbA1c-level, to which the retina is adapted. This will be performed by means of ERG implicit time measurements in relation to the blood glucose level during an oral glucose tolerance test (OGTT) and inter- or extrapolation to the level of blood glucose (or HbA1c) where implicit time is normal.
- To examine darkadaptation in diabetics in relation to changes in the glucose level.
- To examine vessel diameter changes in diabetic individuals when changing the glucose level transiently
Study 1: 24 type 2 diabetics with minimal diabetic retinopathy but varying HbA1c level.
Study 2: 24 type 2 diabetics with minimal diabetic retinopathy. Study 3: 24 type 2 diabetics with minimal diabetic retinopathy.
Plan of trial:
Study 1: Test individuals will be examined at baseline: Prior history of illness, eye examination, blood test, fundusphoto and fullfield-ERG. Afterwards test individuals will take an oral glucose tolerance test (OGTT) which results in a peak in blood glucose after approx. 2 hours, whereafter the blood glucose level normalizes. Immediately after the sugar intake test individuals will be examined by repeated fullfield-ERG's and blood glucose measurements (every 30 min) until the blood glucose level has been normalized.
Study 2: Test individuals will be examined at baseline: Prior history of illness, eye examination, blood test, fundusphoto and dark adaptation. Afterwards test individuals will take an oral glucose tolerance test (OGTT) which results in a peak in blood glucose after approx. 2 hours, whereafter the blood glucose level normalizes. 80 minutes after the sugar intake test individuals will be examined by repeated dark adaptation and blood glucose measurements.
Study 3: Test individuals will be examined at baseline: Prior history of illness, eye examination, blood test, fundusphoto. Afterwards test individuals will take an oral glucose tolerance test (OGTT) which results in a peak in blood glucose after approx. 2 hours, whereafter the blood glucose level normalizes. At baseline (fasting) and 80 minutes after the sugar intake test individuals will be examined by redfree photos of optic disc and blood glucose measurements.
Allocation: Randomized, Control: Placebo Control, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject), Primary Purpose: Basic Science
Glostrup University Hospital, Copenhagen
Published on BioPortfolio: 2014-08-27T03:19:29-0400
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