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Updated: Jul 4, 2026
Isolation of Retinal Arterioles for Ex Vivo Cell Physiology Studies
Published on: July 14, 2018
Analysis of retinal arteriolar structure in never-treated patients with essential hypertension
Martin Ritt1, Joanna M Harazny, Christian Ott
1Department of Nephrology and Hypertension, University of Erlangen-Nuremberg, Erlangen, Germany.
Insights
Essential hypertension is linked to a higher wall-to-lumen ratio in retinal arterioles, indicating increased cardiovascular risk. Elevated blood pressure independently predicts this structural change in small arteries.
Area of Science:
- Ophthalmology
- Cardiology
- Vascular Biology
Background:
- Increased small artery wall-to-lumen ratio is a known predictor of poor cardiovascular outcomes.
- Retinal arterioles offer a window into microvascular changes associated with systemic diseases.
Purpose of the Study:
- To investigate retinal arteriolar structure in never-treated essential hypertension patients.
- To determine the association between elevated blood pressure and retinal arteriole wall-to-lumen ratio.
Main Methods:
- In vivo assessment of retinal arteriole wall-to-lumen ratio using scanning laser Doppler flowmetry.
- Comparison between 21 untreated essential hypertensive men and 29 untreated normotensive men.
Main Results:
- Essential hypertension patients exhibited a significantly higher wall-to-lumen ratio (0.36 vs. 0.28, P=0.028).
- Wall cross-sectional area did not differ, but the growth index was 18%.
- Both systolic and diastolic blood pressures were independently associated with increased wall-to-lumen ratio.
Conclusions:
- Retinal arteriolar structural changes in hypertension mirror those in other small arteries.
- Blood pressure is a critical and independent determinant of the wall-to-lumen ratio in retinal arterioles.
Objective:
Increased wall-to-lumen ratio of small arteries is a predictor of adverse cardiovascular prognosis. We aimed to analyze retinal arteriolar structure in never-treated patients with essential hypertension and to test whether elevated blood pressure is associated with an increased wall-to-lumen ratio of retinal arterioles.
Methods:
The study cohort comprised 21 untreated male patients with essential hypertension (mean age 39.1 +/- 5.4 years) and 29 untreated normotensive men (mean age 36.7 +/- 5.9 years). Wall-to-lumen ratio of retinal arterioles was assessed in vivo using scanning laser Doppler flowmetry.
Results:
Patients with essential hypertension had a higher wall-to-lumen ratio of retinal arterioles than normotensive individuals (0.36 +/- 0.1 vs. 0.28 +/- 0.1, P = 0.028). Wall cross-sectional area of retinal arterioles did not differ between the study groups. The growth index, indicating the percentage of difference in average wall cross-sectional area of retinal arterioles between both groups, was 18%. Both systolic (r = 0.360, P = 0.010) and diastolic (r = 0.536, P < 0.001) blood pressures were related to wall-to-lumen ratio of retinal arterioles. Multiple regression analysis including a variety of known cardiovascular risk factors revealed that blood pressure is independently associated with an increased wall-to-lumen ratio of retinal arterioles (systolic blood pressure: beta = 0.417, P = 0.012; diastolic blood pressure: beta = 0.548, P = 0.001).
Conclusion:
The changes in arteriolar structure of retinal vessels in our study cohort revealed a similar pattern to that observed previously by other investigators in subcutaneous small arteries in essential hypertension. Blood pressure emerged as an important and independent determinant of wall-to-lumen ratio of retinal arterioles.
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