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Documenta Ophthalmologica
Erschienen in: Documenta Ophthalmologica 3/2006

01.11.2006 | Original Paper

Retinal function and histopathology in rabbits treated with Topiramate

verfasst von: S. Kjellström, A. Bruun, B. Isaksson, T. Eriksson, S. Andréasson, V. Ponjavic

Erschienen in: Documenta Ophthalmologica | Ausgabe 3/2006

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Abstract

Purpose

To evaluate retinal function and histopathology in rabbits treated orally with the anti-epileptic drug topiramate.

Methods

Six rabbits were treated with a daily oral dose of topiramate during a period of eight months. Six rabbits receiving water served as controls. Blood samples were analyzed for determination of topiramate serum levels in order to ensure successful drug exposition. Standardized full-field electroretinograms (ERGs) were performed before treatment and then at 2, 3 and 8 months during the treatment period. After terminating treatment the rabbits were sacrificed and the morphology of the sectioned retina was studied.

Results

After eight months of treatment the full-field ERG demonstrated normal rod function in treated and control rabbits, but the light adapted 30 Hz flicker b-wave amplitude was significantly reduced in the treated rabbits. This was the case for both the light adapted (Wilcoxon signed ranks test, P = 0.046) and the dark adapted (Wilcoxon signed ranks test, P = 0.028) 30 Hz flicker response from the treated rabbits. Retinal immunohistology revealed a severe accumulation of GABA in amacrine cells and in the inner plexiform layer in 4 of 6 treated rabbits compared to the controls.

Conclusions

Topiramate, orally administrated to rabbits, may cause a significant reduction of the retinal function demonstrated by the reduced b-wave amplitude in the full-field ERG, as well as changes in immunohistology characterized by a severe accumulation of GABA in the inner retina. The retinal dysfunction and the morphological changes indicate that topiramat may damage the retina, similarly to vigabatrin (another anti-epileptic drug).
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Metadaten
Titel
Retinal function and histopathology in rabbits treated with Topiramate
verfasst von
S. Kjellström
A. Bruun
B. Isaksson
T. Eriksson
S. Andréasson
V. Ponjavic
Publikationsdatum
01.11.2006
Verlag
Springer-Verlag
Erschienen in
Documenta Ophthalmologica / Ausgabe 3/2006
Print ISSN: 0012-4486
Elektronische ISSN: 1573-2622
DOI
https://doi.org/10.1007/s10633-006-9027-8

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