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Abstract #6262 Published in IGR 2-2

Intrascleral concentration vs depth profile of mitomycin-C after episcleral application: impact of applied concentration and volume of mitomycin-C solution

Vass C; Georgopoulos M; El Menyawi I; Radda S; Nimmerrichter P
Experimental Eye Research 2000; 70: 571-575


The purpose of this study was to investigate the impact of different concentrations and volumes of mitomycin-C (MMC) on the intrascleral concentration versus depth profile of MMC in an experimental model. The episcleral sides of scleral quadrants of human donor eyes were exposed for one minute to sponges (corneal light shield, Merocel Corp.) soaked with MMC. After irrigation with 40 ml saline a central 8 mm diameter scleral disc was horizontally dissected with a cryotome. MMC concentrations of six layers of 140 μm thickness were analyzed by means of high-performance liquid chromatography. In experiment 1 (11 eyes) the sponges were soaked with 50 μliters of 10, 100 and 200 μg ml-1 MMC solutions. In experiment 2 (12 eyes) the sponges were soaked with 10, 30, 50 and 80 μl of a 200 μg ml-1 isotonic MMC solution. In experiment 1 the MMC concentrations (μgram g-1) of layer 1 were 0.35 (± 0.20; 10 μg ml-1 group) and 9.22 (± 2.92; 200 μg ml-1 group). In experiment 2 the MMC concentrations were 2.57 (± 1.17; 10 μl group), 7.35 (± 2.49; 30 μl group) and 11.67 (± 3.25; 80 μl group). The scleral MMC concentrations were significantly influenced by the applied concentrations (layers 1-5) and by the applied volumes (all layers) of MMC solution. The intrascleral MMC concentration increased linearly with increasing concentration and not linearly with increasing volume of the applied MMC solution. To achieve more predictable scleral concentrations of MMC after trabeculectomy with MMC it seems advisable to control both the concentration and the volume of the MMC solution used to soak the sponge.

Dr. C. Vass, Department of Ophthalmology, University of Vienna, Vienna, Austria


Classification:

12.8.10 Woundhealing antifibrosis (Part of: 12 Surgical treatment > 12.8 Filtering surgery)



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