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Retinal function in relation to improved glycaemic control in type 1 diabetes
S K Holfort1, K Nørgaard, G R Jackson
1Department of Ophthalmology, Glostrup Hospital, Nordre Ringvej 57, 2600 Glostrup, Denmark. STKRHO02@glo.regionh.dk
Diabetologia
|April 26, 2011
Summary
Improved glycemic control with continuous subcutaneous insulin infusion (CSII) in type 1 diabetes led to delayed but significant improvements in retinal rod function. This suggests a long-term impact of blood sugar on the cells driving diabetic retinopathy.
Area of Science:
- Ophthalmology
- Endocrinology
- Diabetology
Background:
- Diabetic retinopathy is a leading cause of vision loss.
- Effective glycemic control is crucial for managing diabetic complications.
- The long-term effects of sustained glycemic reduction on retinal function require further elucidation.
Purpose of the Study:
- To investigate long-term changes in retinal function following sustained glycemic reduction in type 1 diabetes.
- To assess the impact of continuous subcutaneous insulin infusion (CSII) on objective measures of retinal function.
Main Methods:
- A prospective study involving 17 participants with type 1 diabetes and minimal to moderate retinopathy.
- Participants switched from conventional insulin injections to CSII.
- Objective measures of retinal function, including dark adaptation and electroretinography, were assessed at baseline and at 1, 4, 16, and 52 weeks after CSII initiation.
Main Results:
- Glycated hemoglobin A1c (HbA1c) decreased from 9.1% to 7.4% after 1 year of CSII.
- Significant improvements in rod photoreceptor dark adaptation and dark-adapted b-wave amplitudes were observed at 52 weeks (p < 0.0001 for time to rod-cone break).
- No significant changes were noted in cone function or retinopathy progression.
Conclusions:
- Sustained glycemic reduction via CSII leads to a delayed improvement in retinal rod function, appearing after 4 months.
- This delayed improvement correlates with the timeline of early worsening of diabetic retinopathy in response to glycemic control.
- Glycemic control exerts a long-term influence on the functional capacity of rod photoreceptors, which are implicated in diabetic retinopathy development.
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