Abstract
To evaluate the potential toxicity of repeated intravitreal injections of bevacizumab in rabbit eyes. Randomized, placebo-controlled experimental animal study. Fourteen chinchilla rabbits; 12 assigned to the experimental group and 2 assigned to the normal control group. Three sequential, biweekly, intravitreal injections of bevacizumab in doses of 2.5 mg/0.1 mL or 5.0 mg/0.2 mL were performed on each rabbit. Evaluations included intraocular pressure (IOP), aqueous flare, B-scan ultrasound, fundus photography, ultrasound biomicroscopy, electroretinography (ERG), and visually evoked potentials (VEPs) performed at baseline and during the follow-up period. The eyes were enucleated at 1 week and 4 weeks after the last intravitreal injection, and underwent light and electron microscopic evaluations, as well as testing for apoptotic activity. After intravitreal injections, no changes were found by regular clinical observation and IOP tests. There was no significant difference in the anterior chamber inflammatory activity evaluated by the laser flare meter. No evidence of retinal toxicity was seen after intravitreal bevacizumab at doses of 2.5 and 5.0 mg by either ERG or flash VEPs. Electron microscopy did show the presence of inflamma...Continue Reading
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