[Vitrectomy for endophthalmitis : Incubation time and prognosis following intravitreal injection vs. cataract surgery].

Background Bacterial endophthalmitis is a rare but devastating complication following intraocular surgery. Guidelines on the diagnostics and treatment are based mainly on experience of endophthalmitis treatment following cataract surgery. Objective In this study we analyzed infectious endophthalmitis cases following either intravitreal operative drug injection (IVOM) or cataract surgery for possible differences in the clinical course and prognosis. Material and methods All cases of endophthalmitis from January 2013 through December 2017 retrieved from our electronic database were examined and analyzed according to the type of intervention, time elapsed until diagnosis, pathogen detection, postinterventional visual acuity and the presence of comorbidities. Results A total of 29 cases were included, 11 secondary to IVOM and 18 secondary to cataract surgery. Symptoms for all cases presented at a mean of 6.8 days, with a significant difference between patients following IVOM (5.5 days) and patients following cataract surgery (4.1 days, p< 0.05). Patients with endophthalmitis following cataract surgery had a significantly better visual outcome 1 year after treatment compared to patients with endophthalmitis following IVOM (p< 0.05). The most commonly isolated pathogen was Staphylococcus epidermidis. Conclusion Knowledge of the typical clinical course in the development of endophthalmitis following IVOM or cataract surgery is a critical prerequisite for the timely diagnosis and initiation of adequate treatment measures. Our results point towards a significantly delayed clinical manifestation of endophthalmitis following IVOM, possibly also caused by the anatomical origin of the infection. In an era of increasing numbers of IVOM this clinical observation could be helpful for a careful follow-up control beyond the previous traditional timepoints.