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Quantitative changes in blood-retinal barrier function in central retinal vein occlusion
Transactions of the Ophthalmological Societies of the United Kingdom
|January 1, 1985
Summary
Fluorophotometry quantifies blood-retinal barrier changes in central retinal vein occlusion (CRVO). This technique measures posterior vitreous fluorescence to assess the impact of venous outflow obstruction.
Area of Science:
- Ophthalmology
- Vascular Biology
- Medical Imaging
Background:
- Central retinal vein occlusion (CRVO) is a significant cause of vision loss.
- The integrity of the blood-retinal barrier (BRB) is crucial for retinal health.
- Understanding BRB dysfunction in CRVO is essential for developing effective treatments.
Purpose of the Study:
- To quantify the effect of venous outflow obstruction on the BRB in patients with CRVO.
- To evaluate the utility of fluorophotometry in assessing BRB permeability in CRVO.
- To correlate quantitative BRB changes with clinical appearances in CRVO.
Main Methods:
- Posterior vitreous fluorescence was measured using fluorophotometry 60 minutes after intravenous sodium fluorescein administration.
- Plasma free fluorescein levels were monitored over 60 minutes.
- A permeability index (PI) was calculated by comparing vitreous fluorescence to plasma fluorescein levels.
Main Results:
- Initially, affected eyes in CRVO patients showed significantly higher mean PI (24.3) compared to unaffected eyes (2.1).
- Over 6-12 months, PI in mild CRVO cases approached normal levels, while severe (ischemic) CRVO maintained elevated PI.
- Qualitative retinal changes correlated with quantitative PI measurements.
Conclusions:
- Fluorophotometry provides a quantitative method to assess BRB disruption in CRVO.
- The degree of BRB impairment correlates with the severity of CRVO.
- This technique can monitor therapeutic responses and disease progression in CRVO.