Effects of SGLT2 inhibitors on parameters of renal venous congestion in intrarenal Doppler ultrasonography.

Background Cardiorenal syndrome is a common condition in clinical practice in which renal venous congestion (VC) plays an important role. Intrarenal Doppler ultrasound (IRD) is a non-invasive method to assess and quantify renal VC. The current study aims to investigate the effects of SGLT2 inhibitor (SGLT2i) therapy on IRD parameters of renal VC. Methods This prospective observational study included patients with chronic kidney disease (CKD) with or without type 2 diabetes mellitus and/or heart failure (HF) with reduced and preserved ejection fraction who had an indication for standard of care SGLT2i therapy. IRD, assessing venous impedance index (VII), and intrarenal venous flow pattern (IRVF) analysis were performed within the interlobar vessels of the right kidney before and 6 months after initiation of SGLT2i therapy. Results A number of 64 patients with CKD and a cardiorenal risk profile were included (mean eGFR 42.9 ml/min/1.73 m2; 56% with HF, and 38% with type 2 diabetes mellitus). 17 patients exhibited signs of VC in the IRD. VII was significantly correlated with levels of NT-proBNP, female gender, NYHA class, and was significantly negative correlated with body mass index. After 6 months, a notable decrease in the mean VII of the right interlobar veins by 0.13 (P < .01) was observed. Stratification according to IRVF pattern showed a significant shift towards reduced renal VC pattern after 6 months (P = .03). Conclusions In this study, SGLT2i therapy resulted in a reduction in renal VC as assessed by IRD. These findings underscore the potential haemodynamic benefits of SGLT2 inhibitors in cardiorenal syndrome and warrant further investigation into their clinical implications.