Abstract
Aim: To compare the serum concentration of bevacizumab after intravitreal injection of bevacizumab (IVB) in an experimental model of branch retinal vein occlusion (BRVO) with control injections in albino rats. Methods: BRVO was created in one eye of each of the 24 albino rats. Another 24 rats served as controls. The BRVO was generated by argon laser photothrombosis after intravenous injection with Rose Bengal. Three days later, IVB (5 µl) was administered to both BRVO and control eyes. The serum concentration of bevacizumab was examined at baseline, 6 h, 1 day, 3 days, 7 days, 14 days, and 28 days after IVB. Results: At baseline, no serum bevacizumab was detected in either group. The serum concentration of bevacizumab reached a peak concentration at 1 day with 5,020 ± 1,602 ng/ml in the BRVO group and 4,103 ± 1,790 ng/ml in the control group (p < 0.001). The concentration decreased subsequently on days 3, 7, 14 and 28. The serum concentration of bevacizumab was significantly higher in BRVO rats up to 28 days after IVB. Conclusions: The serum concentration of bevacizumab after IVB reached its peak on day 1 in both BRVO and control eyes. This value was significantly higher in BRVO rats than in control rats up to 28 days after intravitreal injection.
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