Introduction: To analyze visual and anatomical outcomes after switch to intravitreal brolucizumab therapy in eyes affected by neovascular age-related macular degeneration (nAMD) previously treated with other intravitreal anti-vascular endothelial growth factor (anti-VEGF) agents.
Methods: Retrospective study of eyes with nAMD that underwent intravitreal brolucizumab at San Raffaele Hospital (Milan, Italy) or San Rocco Clinical Institute (Ome, Italy) between January 2021 and July 2022. All study eyes had persistent residual retinal fluid after receiving at least 3 intravitreal injections of other anti-VEGF agents prior to switch to brolucizumab.
Results: Among 66 eyes from 60 patients (35 males; mean age 76.5 ± 7.4 years) with nAMD, 43 (65.2%) eyes received a complete loading dose of 3 brolucizumab injections, while 15 (22.7%) and 8 (12.1%) eyes were treated with 2 or 1 brolucizumab injections, respectively. The average number of brolucizumab injections was 2.5 during 4.0 ± 2.0 months (mean interval between two injections of 51.2 days). Lower letter gains (<5 letter improvement from baseline) were found in eyes that did not complete a loading dose, after a greater number of previous anti-VEGF injections, after a longer duration of disease, and in eyes with a greater rate of macular atrophy at baseline. No serious ocular or systemic adverse events were found after switch to brolucizumab.
Conclusion: nAMD eyes with persistent residual retinal fluid despite frequent anti-VEGF treatment can still gain functional and anatomical improvements after switch to brolucizumab therapy. Despite a relevant heterogeneity in patients' response to brolucizumab, we identified potential biomarkers for functional and anatomical improvement.
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