Background Currently, no effective preventative strategies exist to mitigate Cardiac surgery-associated acute kidney injury CSA-AKI. Sodium-glucose transporter-2 (SGLT2) inhibitors reduced acute kidney injury (AKI) incidence in large, randomized placebo-controlled outcome trials. We hypothesized that perioperative SGLT2 inhibition could also reduce CSA-AKI.
Methods In this open-label phase IV, randomized, parallel-group, pilot study, adult patients undergoing elective cardiac surgery with cardiopulmonary bypass were randomized to receive either daily an SGLT2 inhibitor, (empagliflozin (10 mg; oral)) from three days prior to surgery until postoperative day two or standard-of-care. Serum and urine biomarkers for acute kidney injury were measured, including NGAL, KIM-1, and HIF-1 α . Additional outcomes included AKI incidence according to Kidney Disease: Improving Global Outcomes (KDIGO) criteria as well as metabolic parameters, including ketone body concentrations and glycemic control.
Results Between March 2022 and April 2023, 55 patients were included (sex: 73% male, age: 66 ± 10 years, BMI: 28 ± 4 kg/m2, empagliflozin n = 25, control n = 30) in the intention-to-treat analysis. Empagliflozin significantly reduced the incidence of CSA-AKI (20% vs 66.7%; absolute difference 46.7%, 95% CI, -69.7 – -23.6; P=.001). Following surgery, NGAL, and KIM-1 were found to increase in both arms, whereas a significant increment in serum HIF-1α after surgery was solely observed in the control group. We observed no between-group differences in the incidence of (euglycemic) ketoacidosis or hypoglycemic events.
Conclusions Perioperative SGLT2 inhibition, compared with standard of care, significantly reduced the incidence of CSA-AKI. These findings warrant validation in large-scale, double-blind, placebo-controlled, randomized trials