To determine whether sterile preloading of anti–vascular endothelial growth factor agents reduces the risk of postintravitreal injection endophthalmitis.
This is a retrospective cohort study using medical claims data from a large, national US insurer. Cohorts were created using intravitreal injections of anti–vascular endothelial growth factor injections from 2005 to 2016. For inclusion, patients had to have at least 6 months of data before the injection and were excluded for any previous diagnosis of endophthalmitis, multiple injected drugs on the day of injection, or intraocular surgery within 15 days of the injection or between an injection and a diagnosis of endophthalmitis. The primary outcome was the odds of endophthalmitis after an intravitreal injection.
A total of 706,725 bevacizumab, 210,849 ranibizumab, and 177,731 aflibercept injections were given to 130,327 patients. Multivariate analysis showed that ranibizumab and aflibercept together had an increased odds of endophthalmitis (odds ratio = 1.29, 95% confidence interval: 1.04–1.59, P = 0.02) compared with bevacizumab. Individually, ranibizumab (odds ratio = 1.25, 95% confidence interval: 0.97–1.61, P = 0.08) and aflibercept (odds ratio = 1.34, 95% confidence interval: 0.99–1.81, P = 0.06) each had higher odds of endophthalmitis, but neither result met significance. Also, when compared with male patients, female patients had a higher odds of getting endophthalmitis (odds ratio: 1.30, 95% confidence interval: 1.05–1.61, P = 0.02).
The odds of endophthalmitis with aflibercept and ranibizumab combined were higher compared with the sterilely preloaded bevacizumab, arguing for a safety advantage of sterile preloading of anti–vascular endothelial growth factor injections.
Sterile prepackaging of anti–vascular endothelial growth factor agents into syringes reduces the risk of postinjection endophthalmitis. Women may also be at higher risk for postinjection endophthalmitis compared with men.
*Department of Ophthalmology, Scheie Eye Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;
†Center for Preventative Ophthalmology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;
‡Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania; and
§Leonard Davis Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
Reprint requests: Brian L. VanderBeek, MD, MPH, MSCE, Scheie Eye Institute, 51 North 39th Street, Philadelphia, PA 19104; e-mail: email@example.com
National Institutes of Health K23 Award (1K23EY025729-01) and University of Pennsylvania Core Grant for Vision Research (2P30EYEY001583). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. Additional funding was provided by Research to Prevent Blindness and the Paul and Evanina Mackall Foundation. Funding from each of the above sources was received in the form of block research grants to the Scheie Eye Institute. None of the organizations had any role in the design or conduction of the study
None of the authors has any conflicting interests to disclose.
Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (www.retinajournal.com).
This research was conducted entirely at the University of Pennsylvania. B. L. VanderBeek had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.