Comparison of eGFR Levels in Patients Before and After Intravitreal Bevacizumab (Anti-VEGF) Injection

Background: Estimated glomerular filtration rate (eGFR) is a vital indicator of kidney function, particularly in patients receiving treatments that may impact renal health, such as intravitreal anti-vascular endothelial growth factor (anti-VEGF) injections like bevacizumab. Bevacizumab, commonly used to treat retinal diseases like diabetic retinopathy, has raised concerns about its potential systemic effects, including its impact on kidney function due to the role of VEGF in maintaining glomerular integrity. This study investigates the effect of bevacizumab injections on renal function in patients with diabetic kidney disease (DKD) and those without. Objective: To assess changes in eGFR before and after intravitreal bevacizumab injections in patients with and without diabetic kidney disease, evaluating whether these injections significantly affect renal function. Methodology: This quasi-experimental study was conducted in the Department of Ophthalmology, Bangabandhu Sheikh Mujib Medical University (BSMMU), from April 2019 to August 2021. Forty patients with diabetic retinopathy were selected, divided equally into DKD and non-DKD groups. Serum creatinine and eGFR were measured within 30 days before the injection and one month after the third dose of intravitreal bevacizumab. eGFR was calculated using the CKD-EPI equation, and statistical analysis was performed using SPSS. Results: The mean pre-injection eGFR was 69.35±25.91 ml/min/1.73m² in the DKD group and 96.7±30.59 ml/min/1.73m² in the non-DKD group. Post-injection, the mean eGFR was 73.3±33.87 ml/min/1.73m² in DKD patients and 93.6±29.7 ml/min/1.73m² in non-DKD patients. The mean differences in eGFR were not statistically significant between pre- and post-injection measurements in either group (p>0.05). Conclusion: Intravitreal bevacizumab injections did not cause significant changes in eGFR in both DKD and non-DKD patients, suggesting that the treatment is unlikely to have a detrimental impact on renal function in the short term. Further studies are needed to assess the long-term effects of repeated injections.