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Modifying subsceral fluid pressure in an experimental model of mitomycin-C diffusion
M Georgopoulos1, C Vass, Z Vatanparast
1Department of Ophthalmology, Medical School, University of Vienna, Währinger Gürtel 18-20, Vienna A-1090, Austria. michael.georgopoulos@akh-wien.ac.at
Experimental Eye Research
|December 10, 2002
Summary
This study developed a new in vitro model to investigate mitomycin-C (MMC) diffusion through the sclera in glaucoma surgery. Intraocular pressure did not affect MMC concentration gradients, suggesting other factors influence its diffusion and potential toxicity.
Area of Science:
- Ophthalmology
- Surgical Innovation
- Drug Delivery Research
Background:
- Episcleral mitomycin-C (MMC) application in glaucoma surgery can impair wound healing.
- Transscleral diffusion of MMC may cause ciliary body toxicity, reducing aqueous humor production and leading to hypotony.
Purpose of the Study:
- To develop an experimental in vitro model to study the influence of intraocular pressure on MMC diffusion through the sclera.
- To investigate MMC penetration into subscleral compartments.
Main Methods:
- Human donor eyes were used with scleral quadrants mounted on tubes to simulate intraocular volume.
- Varying intraocular pressures (0-80 mmHg) were applied, and episcleral MMC exposure was performed.
- MMC concentrations in scleral layers, subscleral sponges, and fluid were analyzed using high-performance liquid chromatography.
Main Results:
- MMC concentration decreased progressively from the episcleral sponge through scleral layers to the subscleral sponge.
- Detectable, albeit low, concentrations of MMC were found in the fluid within the simulated intraocular space.
- Simulated intraocular pressures did not alter the concentration gradient of MMC across the sclera.
Conclusions:
- A novel in vitro model was successfully developed to assess transscleral MMC diffusion.
- Intraocular pressure does not appear to be a significant factor in MMC diffusion through the sclera in this model.