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Dynamic retinal vessel response to flicker in obesity: A methodological approach
Konstantin E Kotliar1, Ines M Lanzl, Arno Schmidt-Trucksäss
1Department of Prevention and Sports Medicine, Technische Universität München, Connollystr. 32, 80809 Munich, Germany.
Microvascular Research
|November 25, 2010
Summary
Obese individuals show impaired retinal blood vessel function compared to healthy controls. The Dynamic Vessel Analyzer (DVA) revealed reduced dilation and slower responses in retinal arterioles and venules of obese subjects.
Area of Science:
- Ophthalmology
- Vascular Biology
- Metabolic Disorders
Background:
- Obesity and metabolic disorders negatively impact vascular endothelial function.
- Retinal microcirculation offers a window into systemic vascular health.
- Assessing retinal vessel dynamics is crucial for understanding metabolic disease effects.
Purpose of the Study:
- To investigate alterations in retinal microvascular function in obese individuals using flicker stimulation.
- To compare the dynamic response of retinal vessels in obese subjects versus healthy controls.
Main Methods:
- Utilized the Dynamic Vessel Analyzer (DVA) to measure retinal arteriolar and venular responses to flicker light.
- Included 46 obese individuals and 46 age- and gender-matched healthy controls.
- Conducted anthropometry, blood pressure measurements, and blood sampling for clinical assessment.
Main Results:
- Obese subjects exhibited significantly reduced maximal arteriolar dilation (3.2% vs. 4.1%) and prolonged time to dilation (18.0s vs. 14.6s) compared to controls.
- Mean maximal venular dilation was also significantly lower in the obese group (3.9% vs. 4.7%).
- Waist circumference showed a significant negative correlation with the "area under the reaction curve" in arterioles (r=-0.40).
Conclusions:
- Functional retinal arteriolar reactivity to flicker stimulation is impaired in obese individuals.
- Quantitative analysis of retinal vessel response dynamics can effectively characterize vascular alterations in metabolic diseases.
- DVA is a valuable tool for assessing microvascular dysfunction associated with obesity.
