COVID-19 impact on delayed clinical visits in diabetic retinopathy patients

ABSTRACT

Purpose: The COVID-19 pandemic created an unprecedented setback for diabetic retinopathy (DR) patients receiving routine anti-vascular endothelial growth factor (VEGF) injections. In this retrospective clinical study, we assessed visual and anatomical outcomes of “late follow-up” appointments cancelled or rescheduled during an 11-week quarantine period from March 15th- June 1st, 2020, due to the urgency to limit non-emergent clinical visits. This study tested the hypothesis that strict frequency of treatment is a requisite for successful therapy. Methods: To meet “late follow-up” requirements, all study patients had appointments scheduled within the quarantine period that were delayed past their previous physician recommended interval, beyond June 1st, 2020. Of the 7042 delayed patients, 5137 returned for examination. 2764 were injection patients, of which 616 were delayed beyond the quarantine period. These 616 patients were subsequently categorized by diagnosis. We then analyzed the electronic medical record (EMR) for 300 eyes with treatment-requiring diabetic retinopathy to establish baseline anatomical and visual status prior to the delayed clinical visit. The EMR of the follow-up appointment was subsequently viewed for comparison. Best-corrected visual acuity (BCVA) and retinal examination findings were recorded from both visits. All eyes received at least 1 anti-VEGF injection prior to March 15th, 2020. Results: 300 eyes were delayed beyond their previously scheduled interval an average of 14.04 weeks. Upon return, 37 eyes (12.3%) had improved BCVA, 169 (56.3%) remained stable, and 94 (31.4%) had worsened. Of the 300 eyes, there was an average of 2.2 lines lost (p=0.03). 29 delayed eyes (9.7%) returned with improved macular edema, 121 (40.3%) remained stable, and 143 (47.7%) had worsened upon examination. Due to vitreous hemorrhage, edema progression in 7 eyes (2.3%) was unknown. 290 eyes (96.7%) remained with non-proliferative DR, while 10 (3.3%) progressed to proliferative DR. 23 (7.6%) returned with new or worsened vitreous hemorrhages. No patients developed a retinal tear or detachment during this period. Conclusions: COVID-19 had a severe impact on routine clinical visits. Prolonged frequency of anti-VEGF treatment for DR is associated with increased risk for BCVA decline and negative anatomical outcomes. Effective therapy requires strict compliance with intravitreal injections and routine clinical appointments.