Safety and efficacy of fluocinolone acetonide intravitreal implant (0.59 mg) in birdshot retinochoroidopathy

Abstract

Purpose: To report the treatment outcomes of the fluocinolone acetonide intravitreal implant (0.59 mg) in patients with birdshot retinochoroidopathy whose disease is refractory or intolerant to conventional immunomodulatory therapy.

Methods: A retrospective case series involving 11 birdshot retinochoroidopathy patients (11 eyes). Eleven patients (11 eyes) underwent surgery for fluocinolone acetonide implant (0.59 mg). Treatment outcomes of interest were noted at baseline, before fluocinolone acetonide implant, and then at 6 months, 1 year, 2 years, 3 years, and beyond 3 years. Disease activity markers, including signs of ocular inflammation, evidence of retinal vasculitis, Swedish interactive threshold algorithm-short wavelength automated perimetry Humphrey visual field analysis, electroretinographic parameters, and optical coherence tomography were recorded. Data on occurrence of cataract and raised intraocular pressure were collected in all eyes.

Results: Intraocular inflammation was present in 54.5, 9.9, 11.1, and 0% of patients at baseline, 6 months, 1 year, 2 years, 3 years, and beyond 3 years after receiving the implant, respectively. Active vasculitis was noted in 36.3% patients at baseline and 0% at 3 years of follow-up. More than 20% (47.61-67.2%) reduction in central retinal thickness was noted in all patients with cystoid macular edema at 6 months, 1 year, 2 years, and 3 years postimplant. At baseline, 54.5% patients were on immunomodulatory agents. This percentage decreased to 45.45, 44.4, and 14.28% at 1 year, 2 years, and 3 years postimplant, respectively. Adverse events included increased intraocular pressure (54.5%) and cataract formation (100%).

Conclusion: The data suggest that fluocinolone acetonide implant (0.59 mg) helps to control inflammation in otherwise treatment-refractory cases of birdshot retinochoroidopathy. It is associated with significant side effects of cataract and ocular hypertension requiring treatment.