Vigabatrin effect on inner retinal function

Area of Science:

• Ophthalmology
• Neuroscience
• Pharmacology

Background:

• Vigabatrin (VGB) is an anticonvulsant medication.
• Electroretinal dysfunction is a potential side effect of VGB therapy.
• The impact of VGB on retinal function requires further investigation.

Purpose of the Study:

• To assess electroretinal dysfunction in patients using Vigabatrin (VGB).
• To explore the influence of cumulative dosage, combination therapy, and VGB discontinuation on electroretinal function.
• To evaluate electroretinal function using electroretinogram (ERG) and electro-oculogram (EOG).

Main Methods:

• Retrospective, comparative case series involving 40 patients.
• Patients were categorized into VGB multitherapy, VGB monotherapy, and off-VGB groups.
• Standardized scotopic, photopic, and 30-Hz flicker ERGs and EOGs were performed.

Main Results:

• Scotopic ERG B-wave reduction occurred in all patient groups.
• 30-Hz flicker ERG results were reduced across all groups.
• EOG abnormalities were noted in all groups, but less frequently in the off-VGB group, suggesting potential reversibility.

Conclusions:

• VGB monotherapy impacts inner retinal function (Müller cells).
• VGB significantly affects outer retinal function, as indicated by EOG abnormalities.
• Retinal function abnormalities may be reversible upon VGB discontinuation.